Capture the flag(Game Idea)

Just a basic premise that I think could be fun. 5v5. It wouldn't have any timers, it would go until 1 team has captured 5-10 flags. The players could attempt to steal a flag and the opposing team would have between 2-5 minutes to challenge them. If they make it the designated 2-5 minutes without being challenged then they would steal the flag cleanly, if the person attempting to steal gets challenged, they will compete. If the stealer wins, they steal the flag, if the stealer loses they go into the penalty box(1-12 hours), and other teammates can also opt to try and free everybody in the penalty box.