On a recent eight-hour shift at a McDonald’s in Hong Kong, Luke Ching, 52, wiped tables, cleared trays of half-eaten fries, emptied cups of soda and milk tea and lugged bulging trash bags to the dumpster. For him, the main…

On a recent eight-hour shift at a McDonald’s in Hong Kong, Luke Ching, 52, wiped tables, cleared trays of half-eaten fries, emptied cups of soda and milk tea and lugged bulging trash bags to the dumpster. For him, the main…