I was grading seed at a grain processing/storage facility for a few years and it had enough down time during the evenings to do any schooling. I managed a full-time pre calculus to shore up my post secondary education requirements. My coworker ended up going back to college for programming and did a lot of his work on the afternoon shift. Our schedule was a 6am-2pm with little down time, and then an afternoon shift from 2pm-10pm with way more free time.

In my case, you didn't have as much down time as some other quieter jobs but they paid ~$30 an hour so there's value if you are looking for some extra cash. No prior experience required.

There was a 12hr night/day rotation for other parts of the facility where you'd swap every few days and get a week off somewhere in the mix but that schedule wasn't for me.