I've seen some very small statured people working in big chains here. I don't think Maccas and their ilk would be taking the risk of illegally employing children, at least not in countries like Australia.
Also, if this is a young child, is it not a bit wrong to be sharing their image around like this?..
If they start working young, how are they gonna learn to play guitar so they can play at the subway terminals when the socialism takes over and we all get our ubi?