I worked a few fast food and restaurant jobs 10+ years ago and we were auto clocked out at closing, but were still required to clean up. I never did and I got let go 2 times for not working for free.
Probably depends on how competitive the market is for workers. When I was trying to get a minimum wage job, it took a while to get. Now it's probably relatively easily. In today's market, they wouldn't try that because those people would go to a place that wouldn't do that and implicitly pays more as a result.
