I work minimum wage part time in the service industry. Turns out my coworkers who started after me are making $2 an hour more than I am. In short, I'm livid about it as it has been going on for a few months now(that I know of). The only reason I could guess why is because we serve alcohol and I'm only 19, which means the only thing I'm not legally allowed to do is pour the drink.
And if that's the reason, I think I'm gonna lose it because I do just as much work, if not more, than some of the 21+ coworkers.
Thankfully, my boss seemed genuinely surprised(he's not in charge of payroll and was also hired after I was) and promised he would have that changed.
Moral of the story, talk with coworkers about how much you're making. It the only reason I found out.