Having 100% exclusive rights over the fruits of a person’s labor, so, a job.

But they don't. I can end this arrangement at any point in time.

Ever applied for a mortgage?

Yes, and I can't remember anyone forcing me to buy this specific apartment, or preventing me from selling it and moving anywhere else.

Regardless, my point wasn't that work isn't slavery, my point is that the pyramids weren't built with slave labor.