I have some pretty valuable stuff in my room. I'd be pretty mad and probably end up yelling at the kid.
Yelling? if he did that in my room , I'd rob a gun shop , take a buckshot and blast the loving door out , along with the kid.
HE AINT TOUCHING MY 70CM PLASMA TV
Just get a key for your room, that way you can have your room locked just incase you leave your room for a second.
Here is a tip:
Lock the door yourself while he tries to escape.
That way you TRAPPED him , he did not lock HIMSELF in.
No guarantees on preservation of your stuff tough.