How to get back at my boss???

ok I work for National Tire and Battery, and my boss is compleate jerk! Let me give you an overview, I am a auto technician and I get paid on commishon, some jobs like doing 4 tires pays me around $4 and some jobs like brakes I could get $70. So about the same amout of time worked. Well by manager is mexican and there are 3 othere auto technicians and 5 oil changer guys. Well the 3 other auto technicians are mexican and 1 of the oil change guys is mexican. My manager gives them everything and anything! Like today... I was working from 11:00 am to 8:00 pm, well my manager said everyone has to stay late for a meeting, except 4 of the people who work there....let they are the mexicans. I have not problom with the othere guys just my manager. He made me stay untill 12:35 AM!!!! At about 10:30 I told him I have to go home to my wife, he told me if I leave then that means I quit! What a jerk! I want to get back at him someway...I was thinking of calling the EPA to investagate.....