LAKELAND, FL—Mel King, the night security guard at 2300 Office Park Drive, can't afford to let his guard down for even six hours, the 47-year-old said Tuesday. "In a job like this, you have to be on full alert every once in a great while," King said. "Lose your focus for three or four hundred minutes, and the place could be robbed blind." King said he makes sure never to drift from his post more than twice per shift or stray from his ritual 3 a.m. viewing of back-to-back episodes of Riptide.