Earlier quoted context omitted.
The previous owners of my house dropped several hundred dollars on a Medeco lock. Keys are a pain in the ass to replace, and there is literally a set of 3 windows within reach in the porch that could be opened trivially. The biggest feature of any lock is breaking into a locked house is a felony for the perp.
My boss once bought a really expensive lock with a magnetic key. He was going on about how it was unpickable. When the key was forgotten one time, we found it could be opened by sticking scissors in and turning. I'm not sure what the moral is. Your comment reminded me of this story.
Leaves guests bewildered when they come to stay.