The key-lock is there to keep the dial from turning. The dial combination can be locked in an open or in a scrambled position. First, set the dial to “0”, then insert the key and turn it half a turn in a counterclockwise motion. The safe will then be locked. To unlock the safe, turn the key half a turn in a clockwise motion, remove the key, and redial the combination or turn the dial back to the opening position.