My dad just nailed the windows shut. In case of fire they could easily be broken. When gfgbro pulled the nails, my dad used construction glue and told bro that if he messed witht hem then dad would "fix" every possession he owned for the next two years.
Bro never went out his room again, but he did go out the front door and in my bedroom windows. Of course he threatened to hurt me if I didn't open the windows to let him in. Since he couldn't open his own windows I lit his cigarettes in htere so his room REEKED and he got in huge trouble. I told him next time I would light his pot in the room and ask my dad what that stench was. Since at the time bro was still paying off having all of our clothes cleaned professionally because he made garlic "tea" and passed out and it burned and filled the entire house with the stench of burned garlic, well, he did NOT want to deal with any more problems because things got burned in the house.
I also set off an entire Sam's size can of Lysol in his room since he hates that scent, and would go in and wake him up at all hours as payback for waking me up to elt him back in after he snuck out to party.
I also filled his skoal cans with dish soap and/or ipecac.