I own the soccer field. If they don't play right I'll kill them and lock them out.
Plausible Method:
Make an invite-only minigame.
Place spawn points inside of the arena.
Name all surfaces you can stand on that are inside of the arena "KillerJoe"
Events for KillerJoe:
(unchecked) [0] onPlayerTouch Player Kill
Events for activation brick:
(checked) [0] onActivate NamedBrick[KillerJoe] seteventenabled 0 (checked)
(checked) [5000] onActivate NamedBrick[KillerJoe] seteventenabled 0 (unchecked)
(checked) [0] onActivate self setRayCasting (unchecked)
Procedure for removing a player:
1. Lock or block the doors.
2. Kick the player from the minigame.
3. If there are still troublemakers in the arena, set activation brick to raycasting, and click it.