Not every state has the ability to force labor (generally per their state constitutions), if I remember a conversation I had years ago with my dad who was a judge. Just they tend to structure their prison sentencing and it release programs such that you’re trading years more of your life if you don’t “voluntarily” cooperate. So you know, tomato tomato.

It’s one of the bigger problems my state has, its reliance on its prisoner-slave workforce for vital services.