Juan Martinez can barely pay the bills, even with the income from his second job as a security guard. Now he hardly sees his family. Juan Carlos Martinez sits in a lonely Miami office tower late on a Sunday night, fighting back yawns as the rumble of passing trucks shake the empty building. He's miles from home, where he'd rather be, helping his children get ready for bed. But he needs this job as a weekend security guard. Martinez is a Miami-Dade teacher with a master's degree in education and ten years of experience. For that, he earns $38,050 a...