ChasingHawk ... so sorry about your Humpty Dumpty moment and do hope that all goes well with surgery and recovery. Should be able to use a keypad doorlock on something you already have. I can think of other things to lock away! Might be a good project for him .... to ponder and make plans for it, as he recovers!
Tartan ... No reason to lose the key. Though you would have yet another pin# to remember!