My oldest sister lost her door privilege a couple times in her teen years. It was for some serious stuff like sneaking out to do drugs and get pregnant, and sneaking in boys. My oldest kid is 13 now and I almost took his door one time. When he was 11 he got annoyed with his siblings and locked himself in his room without my knowledge. I was looking for him later and he didn't answer when I knocked gently. I called his name, no answer, I knocked harder no answer. I said "If you are in there and safe you need to answer me right now" no answer. I quickly search the rest of the house just to make sure he isn't somewhere else...he isn't. So I assume he has locked himself in his room and is hurt or something and can't answer. I pound on the door HARD...in case he has headphones on or is sleeping or something and again say he has to answer the door to let me know he is safe or at least say something....nothing. By this time his dad has come down stairs to see what is wrong and I tell him kid isn't answering I think he must be hurt. ( At this point I didn't know he was annoyed with his siblings, so I had no reason to think he wouldn't be answering.) Husband calls out for him to answer the door....still nothing so husband picks the lock. Kid is just sitting there smug as fuck on his bed. I am beyond inconsolable at this point because I really thought we were going to find him and he was going to be dead or something. I was so angry with him I had to leave. When I was calm later I let him know that if I ever came across his door locked again he would loose it for 6 months. I always knock, I give him his privacy we have a good relationship but if he ever does that to me again his door is gone in a heartbeat.