Helpful information in case you got a broken key in the lock.
- Find a thin-bladed piece of serrated metal. A broken coping saw blade is perfect, if you happen to have one.
- Determine which way the key is oriented. You'll want to work from the side with the teeth, not the smooth side.
- Slide the serrated blade into the keyhole so that the key and blade are tooth-to-tooth.
- Push the blade in far enough for its teeth to grab the key's teeth.
- Draw the blade out slowly and smoothly.