At $20, you'd earn a roughly $40k salary if you were to work full-time. That won't buy you a house, but it will let you rent a room in a house within commuting distance from your place of work, maybe drive an old beater Camry, cook your own food, and have some money saved up for school.

Why not $50, that's a $100k salary - most people would be opposed to it because you'd be able to potentially afford much more than what they perceive a fast food worker should be able to afford.