Helpful information in case you got a broken key in the lock.

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