Locked up

I just did something that I think is a little strange, just to give my slighly paranoid wife some piece of mind. I installed a key lock on our basement door, with the key facing the inside of the basement. I also hid the key in the basement where it would never be found by someone locked in there. The point of this is so that if someone were to break one of those tiny little basement windows and slide their way in during the night, they could not get upstairs because the door would be locked. A little odd, but it makes the wife happy and it makes her feel safe, so I guess it's worth it.