Jamil Segers, 18 years old, was juggling two part-time jobs in retail and restaurants, living paycheck-to-paycheck and delivering pizzas until 2:30 a.m. Then he landed a full-time job in September at a Williamsport, Md., manufacturer assembling and packaging window parts.
“It’s stable, unlike my part-time jobs,” said Mr. Segers.
For most...