Ask yourself, if you ask a man to cut your grass for $20, or about $7 an hour. He consents and you pay him. Your grass is cut and the man leaves with $20, both parties happy.
How have you enslaved the man?
It seems by labeling simple economic exchanges of goods for money as slavery diminishes the true meaning of "slavery," which is ownership of another human being. To conflate paying someone a wage with the brutal and reprehensible act of treating a person like cattle is stupid and dishonest.