It is the first thing everyone tries, and the first thing everyone fails at. Yes, a bobby pin can pick a lock — a cheap, worn, standard-pinned one, with a lot of patience. No, it will not open the padlock on your shed or your front door, and this guide explains exactly why, with the same physics you will use later with real picks.
Can you really pick a lock with a bobby pin?
Yes — within limits that matter more than the trick itself. A bobby pin can open a low-quality pin tumbler lock with standard driver pins and loose tolerances: a diary padlock, an old cabinet lock, a cheap luggage padlock, some interior door knobs. It will not open a lock with security pins, a tight keyway, or a paracentric European cylinder, and it is almost useless on a padlock with a stiff spring.
The reason is not skill. A bobby pin is soft steel, round in cross-section and covered in a plastic coating. Lock picking is a feedback skill: you are reading, through the tool, a movement of a fraction of a millimetre. A bobby pin bends before it transmits that movement, so you are working blind. The technique below is genuine — it is the same technique used with a proper hook — but the tool throws away most of the information you need.
The short version: the method works, the tool does not. If you want to open a lock tonight, a beginner lock pick set with a transparent practice lock costs less than a pizza and works on the first evening. If you are here out of curiosity, read on — the physics is genuinely interesting.
What you need: two bobby pins and five minutes
You need two bobby pins, not one. Lock picking always requires two tools at once:
- A pick — the tool that lifts the pins. This is bobby pin number one, straightened, with a small bend at the tip.
- A tension wrench (also called a turner) — the tool that applies a light turning force to the plug so the pins bind one at a time. This is bobby pin number two, bent into an L.
Also useful: pliers to make clean bends, and something to practise on that you own and do not need. A transparent practice padlock is the honest version of this — you see every pin move, which is the fastest way to understand what your hands are doing.
How to bend a bobby pin into a lock pick
The pick
- Open the bobby pin flat, so it forms a long, straight wire with one wavy side.
- Pull off the plastic tip. It will otherwise jam in the keyway.
- Bend the last 3–5 mm upward at roughly 30–45°. That tiny hook is what will lift the pins.
- Optional, and the reason most attempts fail: flatten the tip slightly with pliers so it is less round.
The tension wrench
- Take the second bobby pin and cut or break off the wavy side, keeping about 4 cm of the straight side.
- Bend it at 90° about 8 mm from one end, into a short L.
- Squeeze that short leg flat with pliers. Flat matters: a round wire rolls in the keyway and gives you nothing to feel.
How to pick a lock with a bobby pin, step by step
This is single pin picking, the same sequence a picker uses with a proper hook. Read it once before you start.
- Insert the tension wrench in the bottom of the keyway and apply a very light turning force in the direction the key would turn. Very light means the weight of a fingertip — about the pressure you would use on a touchscreen.
- Insert the pick above it, all the way to the back of the keyway.
- Test each pin by pushing it up gently. Most feel springy and drop back. One feels stiff and does not want to move: that is the binding pin.
- Lift the binding pin slowly until you feel a faint click and the wrench rotates a hair. The pin is now set — held above the shear line by the edge of the plug.
- Find the next binding pin and repeat. A five-pin lock means five of these, in an order the lock decides, not you.
- When the last pin sets, the plug turns and the lock opens.
If nothing moves and every pin feels identical, you probably have too little tension. If a pin feels mushy, refuses to click, or the lock feels dead, you have too much — which is the case nine times out of ten. Release everything, let the pins drop, and start again lighter.
Gear this guide keeps pointing at
Starter Lock Pick Set – 15 Picks + Transparent Padlock + Pouch
Transparent Practice Padlock – Cutaway Pin Tumbler (Small, Large or Euro Cylinder)
Tension Wrench Set – 7 Double-Head Tension ToolsWhy a bobby pin fails on most locks
1. The steel is too soft
Real picks are 0.5–0.6 mm stainless or spring steel, flat and stiff. A bobby pin is soft, round wire. When you push a pin that resists, the bobby pin flexes instead of lifting — and you feel the bobby pin bending, not the lock working. Within a few attempts the tip deforms and the geometry you carefully bent is gone.
2. The tension wrench is the real problem
Tension is about 80 % of lock picking. A round wire in a keyway twists and slips, so the force you apply jumps around; pins set, then drop, then set again. This is why people conclude "I can't pick locks" when what they actually have is a wrench that cannot hold a steady load.
3. Security pins end the experiment
Any decent lock has spool or serrated driver pins. A spool gives a false set: the plug turns a little, feels open, then stops dead and pushes back against your wrench. Handling that requires reading counter-rotation and easing tension at the right instant — impossible through a bent hairpin. Our guide on security-pin practice locks covers what that feels like.
| Lock | Bobby pin? | Why |
|---|---|---|
| Diary / luggage padlock, 3 pins | Often yes | Loose tolerances, weak springs, standard pins |
| Cheap interior door knob | Sometimes | Wide keyway, standard pins, but stiff springs |
| Brass padlock, 5 pins | Rarely | Tighter tolerances; wire flexes before the pin lifts |
| Euro cylinder (most European doors) | No | Narrow paracentric keyway, often security pins |
| Anything with spool or serrated pins | No | False sets need controlled tension |
Bobby pin vs paperclip vs a real lock pick
A paperclip is even softer than a bobby pin and has no flat surface at all; it works only on wafer locks (cabinets, mailboxes) and warded padlocks. A credit card does not pick anything — card tricks slip a spring latch on a door that has no deadbolt, which is a different attack entirely. A bump key is filed from a real key blank and only works on standard pins.
A proper pick set costs about what you would spend on a takeaway: a short hook, a rake, two tension wrenches and, in the sets worth buying, a see-through lock so you can watch what the pins are doing. That last part is why beginners who start with a clear lock progress in days rather than months.
Fifteen stainless picks, two tension wrenches and — in Set 2 — a transparent practice padlock. The cheapest honest way to replace two bent hairpins, and it is the kit most people learn their first single pin pick on.
See the productPractise on locks you own — that is the whole rule
Lock picking is a legal hobby in nearly all of Europe: owning picks and using them on your own locks is legal in Denmark, Sweden, Norway, Germany, the Netherlands, Poland and Czechia; Finland requires an acceptable reason for possession; the UK restricts carrying tools in public. The rule that keeps it that way is short: only pick locks you own, and never a lock in use. A lock you rely on is not a practice lock, and repeatedly picking it does wear the pins.
Country-by-country detail is on our legality page. If you are locked out of your own home right now, a bobby pin is not the answer — call a locksmith, it will cost less than a replacement door.
Frequently asked questions
Can you pick a door lock with a bobby pin?
Sometimes, on a cheap interior knob with standard pins and a wide keyway. On an exterior door — a Euro cylinder, a mortice lock or anything with security pins — realistically no. The wire is too soft to transmit the feedback you need.
How long does it take to pick a lock with a bobby pin?
On a lock that will open at all, anywhere from two minutes to an hour, and most attempts end with a bent pin. With a proper pick and a transparent practice lock, most beginners rake a lock open in under fifteen minutes and single pin pick it the same evening.
Does picking a lock damage it?
Proper picking rarely damages a lock, but it does burnish and slowly wear the pins. Forcing a soft wire can scratch the plug or leave metal inside the keyway. Another reason to practise on a lock bought for that purpose.
What is the easiest lock to pick with a bobby pin?
A three-pin padlock with loose tolerances — the kind sold as a diary or luggage lock. Wafer locks (cabinets, mailboxes) are easier still and often open with a jiggler key rather than picking.
Is it illegal to carry a bobby pin?
No country regulates hairpins. What matters everywhere is intent: using any tool on a lock that is not yours is the offence, regardless of what the tool is made of.
Should I buy a lock pick set instead?
If the hobby interests you, yes — the cheapest sets cost less than 25 € and include the practice lock that makes the learning curve short. Our buying guide compares them without the marketing.
Next step: the full beginner method, with photos, tension explained properly and a 30-day practice plan — how to pick a lock for beginners. Then choose a lock with the belt ranking.