The ancient Greeks had slaves. Slaves did everything. They cleaned and cooked and worked in the mines and in the shops and on the ships. For the most part, slaves were treated well. They were property. Slaves had no way to buy or earn their way out of slavery. Once someone was a slave, they and their children, and their children's children would all be slaves. There was no escaping your status as a slave.
The Greeks found new slaves in several ways. People sometimes were sold into slavery by their families. Some infants were tossed out to die, and if rescued usually became slaves. Slaves were also people captured in battle.