Every day at 4:30 a.m., Dwayne Wilson, 25, wakes up to find out whether he’s going to be needed as a forklift driver at the warehouse he works at in the Los Angeles neighborhood of Wilmington. Sometimes he gets a call telling him not to come in. Sometimes he goes in to find out that he’s not needed that day. On average, he works just three eight-hour days per week, at $15 per hour.