On Gary's Mod TTT, traitors can enter certain rooms that have restricted access only to them to open and enter/exit...but a later feature could be where all players can go inside and exit them, if that would be a large feature. The map maker could use /ttt settraitordoor (or room if the first option is implemented) and make a selection of that room. There would need to have an exit made, I'm not sure how that should be done though.
On Gary's Mod TTT, traitors can enter certain rooms that have restricted access only to them to open and enter/exit...but a later feature could be where all players can go inside and exit them, if that would be a large feature. The map maker could use /ttt settraitordoor (or room if the first option is implemented) and make a selection of that room. There would need to have an exit made, I'm not sure how that should be done though.