That's a good point! I guess more broadly, I was thinking about a scenario in which the lock device dies, and making the point that conventional devices aren't

That's a good point! I guess more broadly, I was thinking about a scenario in which the lock device dies, and making the point that conventional devices aren't foolproof either. In this case, the fool being me, and the proof being locking my keys in the house. So, any lock can fail, but I'm not really concerned as long as it has a reasonably low failure rate. We've tolerated conventional lock systems failing (via user error mostly) for a long time.