The real story
Almost every shop, warung and mosque in an Indonesian city has a juru parkir, often shortened to jukir. Some are official and collect a city parking fee on a printed ticket; many more are informal, working a stretch of pavement they've claimed, sometimes paying a share to whoever controls that block. The fee for a motorbike is usually a coin or a small note.
The job is a running joke, because the attendant often seems to appear only when you're leaving. But the work behind the whistle is real: watching helmets and bikes, untangling rows of motorbikes, stopping traffic so cars and pedestrians can get out, standing in rain and heat all day. For many people it is one of the few jobs available without capital or a diploma.