My brother Zach was never my friend when we were growing up. It was like living with your worst nightmare and when you have a mother who is ineffective, you have to put your hope in other things. He was obsessed with coming into my room and causing trouble. We'd have the simple door locks, but he'd find ways to get past it, like taking a stick off of a lollipop or a small screw-diver to pop the lock into "unlock". Imagine living with almost no privacy.
This crap happening even after high school ended for both of us. I finally got my mother to replace the broken doors, and demanded she get a new type of door-knob with a key lock instead of the simple ones. My brother protested and said it was dangerous "in case of fire" but I knew his real reason. Ironically he got the same thing for his room, though I never wanted to be in there. For example, every once and awhile I would be in his room, I could spot the things that changed since the last time I was in there.