Yes, but that's always the case. All food requires work, that's just a limitation of humanity.

We can never escape this. At worst we can produce some miserable Huxlean utopia where machines do all the work, and we're condemned to exist as overgrown toddlers who can't take care of ourselves, and only middle class academics dream of such a world.

The problem with slavery is how you have a middleman who helps himself to a very ample margin of surplus.

Moreover, selling any labour is to sell yourself, it's not as if your labour goes to work while you do something else, you are your labour. Only difference between indentured servitude, slavery and waged employment is really just the amount of obligation you have to the market.

Ideally we should have just enough obligation to provide for society at large, but not so much as to exist in a realm of unmitigated tyranny.