How to Extract a Broken Key from a Lock in Under 10 Minutes

The Golden Rule: Do Not Push It Deeper

Finding yourself with a snapped key half-inserted in a door lock is an instant recipe for panic. Your first instinct might be to insert the remaining half of the key to try and turn it, or to poke at it with a finger. Do not do this. Pushing on the broken piece will slide it deeper into the keyway, past the lock pins, making a simple DIY fix nearly impossible. Take a deep breath and use one of these highly effective emergency extraction methods instead.

Gather Your Emergency Tools

Depending on what you have on hand, grab one or more of the following household items:

• Penetrating lubricant: WD-40, dry graphite spray, or even a drop of cooking oil in a pinch.
• A scroll saw or jigsaw blade: The thin, metal kind with tiny, backward-facing teeth. This is the ultimate DIY key extractor.
• Needle-nose pliers or fine tweezers: Only useful if a tiny portion of the key is protruding.
• A hot glue stick: A standard mini-glue stick and a lighter (for a specific emergency hack).

Step 1: Lubricate the Lock Cylinder

Before you try to pull the key out, you must reduce the friction inside the lock. Spray a small amount of WD-40 or dry graphite lubricant directly into the keyway above and below the broken key fragment. Let it sit for 60 seconds to penetrate. This step alone increases your chances of success tenfold.

Step 2: Ensure the Cylinder is in the Neutral Position

A key will only slide out if the lock cylinder is in its upright, unlocked/locked "neutral" position where the pins can retract. If the key snapped mid-turn, use a flathead screwdriver to gently rotate the key slot back to its vertical, default position.

Step 3: The Scroll Saw Blade Method (Best for Deep Breaks)

If the key is broken deep inside the lock, this is the most reliable method professionals use when they don't have specialized tools.

• Insert the blade: Slide a thin scroll saw or jigsaw blade into the keyway right alongside the broken key. Ensure the tiny teeth of the blade are pointing backward (toward you) and upward.
• Hook the key: Gently push the blade in until you feel it slide past the key cuts. Twist the blade slightly so the teeth bite into one of the ridges of the broken key.
• Pull outward: Maintain pressure and pull the blade straight back. The teeth of the blade will grab the key and drag it out. Repeat this motion until enough of the key protrudes to grab with pliers.

Step 4: The Hot Glue Stick Hack (For Flat Breaks)

If the key broke flush with the lock face and you don't have a saw blade, you can use a plastic hot glue stick.

• Melt the tip: Use a lighter to heat the very tip of a mini hot glue stick until it starts to melt and become soft.
• Press and hold: Press the melted end of the glue stick firmly against the broken key face. Be extremely careful not to push the glue into the keyway surrounding the key—you only want it to stick to the exposed metal face.
• Let it cool: Hold it perfectly still for 2 to 3 minutes until the plastic cools and hardens completely.
• Pull straight back: Give the glue stick a firm, straight pull. The suction and adhesion should draw the key fragment right out of the lock.

Step 5: Grab and Remove

Once either method has pulled the broken key fragment at least a few millimeters out of the keyhole, grab the exposed tip firmly with your needle-nose pliers or tweezers and pull it straight out. Wipe down the lock cylinder to remove any excess lubricant, and you are ready to use your spare key!