This almost sounds like a gadget from voice commands.repertoire, but it seems to be legit. This mini-safe opens not from the usual cumbersome combination of numbers but from your own
If you forget the secret word, the safe tells you to try again in four preset phrases. (It sounds like a bad sitcom already.)
On the other hand, you could set up a hidden camera and have fun watching others trying to guess the code. Booby-traps might be in order as well. Maybe this isn't such a bad idea after all.