When the alternative is starving, taking a worse deal is just what you have to do. And Walmart controls the workers hours, so that's a huge mess.

This can become abusive in a hurry. Suppose the net after gas is that delivering packages pays $5/hr. Walmart knows how many deliveries their workers take, how many they need, and what hours get scheduled. More packages need going out? Cut hours for folks not delivering, schedule the folks delivering for more days with short shifts or split shifts.