I know plenty of people working 2 jobs and simply don't have time to find a replacement for one. With wages at record lows, that also means if they lose one for any reason, it's not like a little breaky break while they find another, it means something on their extremely narrow budget gets the axe for that week or whatever. Usually healthcare, sometimes food. Sometimes rent, at which point if you don't have a friend's couch to crash on, you're homeless, and then it's astronomically harder to find a job. You are well and truly fucked.

So not everyone is "free to leave the job."

BTW I don't know the OP but the word I was going to drop in was not prison, it was slavery.