"Using a paperclip or thin piece of metal with a small bent tip in the shape of an "L". Once inside the key hole the subject moves the object in a circular motion to disengage the pawl and ratchet mechanism unlocking the single strand, allowing the subject to escape freely. 2. Using a hard sharp instrument and driving it into the key hole, vigorously moving it in circular motion until you hear the pawl and ratchet break, again unlocking the single strand, allowing the subject to escape freely."
http://www.policeone..ung/articles/107554/