A slave rebellion can be a great team-building exercise. Covering the walls with unflattering graffiti about your boss will create wonderful camaraderie among you drones.

Why the he'll didn't you walk out, I'm sorry, but they can't force you to be there and not pay you, you staying means you deserved it.

if its mandatory you must also be paid... you should've just walked out... and when they threaten termination, you threaten with legal consequences

it's illegal for your boss to not pay you.

Everybody grab a brush, but also a different color paint. And don't be neat about it, slather it all over, not just on the walls. Get everything covered really well...

I would have left and reported your boss.