How do i close rooms in multiplayer plugin?

I was wondering if there is a way to close the room, so no new peers are connected. I know that i can kick new ones but that's a waste of bandwith and timing.

This is because my game allows new players until a set time, after that, the room must close and no new players will join in, there is no "visitor" view.

also, is there a way to know the index position of the room when created? if there is more than one room. So the peer only needs the index position to enter and not the entire ID