I was an opener at a gym and the only employee in the building from 5:30am-9am 5 days a week.
The manager position directly above me opened up. I applied, and got it.
After 2 weeks of working this position I was introduced to the manager they hired for this role. Then they said I was too valuable as the opener and it's easier to fill the manager role than the former.
The 80 hours I worked as manager were paid at $8.75 per hour instead of the $12 I was promised and the next Monday I was scheduled back for opening and only 27.5 hours.
So needless to say I quit. I never missed a day. Did my job so well I was invaluable and they STILL rugpulled me.
Hard work is punished in the US.