Boss Wants Me To Take My Time Leaving After Clocking Out.

I work at a family owned car dealership. I clock out at exactly 7 PM every day and try to leave immediately. I get a shitty pay ($17), no benefits, no commission on car sales, no paid time off, no over time and I work 6 days a week. Anyways, once I clock out I try running out of there but there’s times where the owner wants to recount the money in the drawer AFTER 7, she takes her time to leave and I have to close the garages behind her and I have to close the front gate AFTER 7. She constantly complaining that I’m always in a rush to leave but once I clock out I’m ready to go. Can I get fired for this? Am I wrong for rushing her? This is in GA.