4. Use a Small Saw Blade
Another effective method involves using a small saw blade, like a jigsaw blade or a mini hacksaw blade. These can often be found in DIY stores or might already be in your toolbox. The blade should have sharp teeth and be small enough to fit alongside the broken key in the lock.
Carefully insert the blade into the lock, positioning it so the teeth catch the key. Gently wiggle and pull the blade to grip and move the key piece out of the lock. This method requires patience and a steady hand, but it can be quite successful in extracting the broken key.