Complain to management about it and encourage others to do so as well. You can see how overworked and underpaid they must be and you don't like giving your business to such a place. Make sure it's about seeing how long people are working and not that they look unhappy or anything that can make a workers life harder. If they force a happy face on employees while still doing the same crap, keep calling em out. Be the crank you want to see. It's fun.

Edit: I wish I was old rn instead of when it won't matter. Just distracting a Manger for a full day talking about how minimum wage would buy you a house no mortgage required and the longest car in town on your first paycheck with enough left over to see a moving picture show and how they should be ashamed for what they're doing to young people. Old person guilt is an amazing superpower.