Different companies have different policies based on their needs. I worked at a factory that couldn’t get enough skilled labor in the door, so they instituted mandatory overtime for two years: everyone had the option of 5 days at 10 hours or 6 days at 8.5 hours. Everything beyond 40 was time-and-a-half, but if you didn’t work at least 50 hours in a week, you got written up.

Some people absolutely loved it because it was “extra” money, but a lot more left for other factories, only exacerbating the problem.