The United States does have forced labor, although not a whole lot that isn't under a pretense of a optional program. Notably at Angola (https://www.washingtonpost.com/history/2022/11/10/angola-pri...)

But even if you want more, what should the prision do if a prisioner refuses to participate in the forced labor? How do you force them. Violence and torture is the only ultimate way. That is what you are demanding.