Exactly. Getting people to work when in involuntary servitude is a solved problem. You can research some of the history of what methods were used to get African slaves to work, especially in the early colonial Caribbean colonies, if you really want to lose faith in humanity.

It was actually a quite difficult problem from the slaver's perspective. You kidnap some guy from the coast of West Africa. You take him from his family, haul him across an ocean, and force him to work against his will on a sugar plantation on a Caribbean island. You offer him no way out and instruct him he's to work as hard as he can until he keels over and dies. He gets nothing from his work, and he has no way to earn or buy his freedom. Oh, and he doesn't think he did anything to deserve this treatment either.

Exactly what motivation does this man have to work for you exactly? Early on, in these slave colonies, the slavers found that many abducted people would simply refuse to eat and starve themselves to death. The inescapability of their predicament meant that the slaves couldn't even hold out hope for eventual rescue or escape. It would be like if you were abducted by aliens and hauled off to a planet in another galaxy. There's simply no way you're escaping and getting back home. So many slaves would simply refuse to work and just starve themselves to death.

Eventually the slavers did figure out ways to coerce slaves into working. And those methods are as bad, and probably even worse, than you can imagine.