A Chinese vocational school sends five 15-year-old boys to assemble Sony PlayStations at a Foxconn manufacturing plant. The legal age to do such work is 16.YANTAI, China — The five schoolboys weren't of legal age to work on an assembly line. But when their vocational school sent them to a Foxconn manufacturing plant last month as part of an internship program, they were soon piecing together Sony PlayStations 12 hours a day.