I'm not sure if that says more about the workers or your requirements. By 'work hard' you can only mean 'performing hours of tedious unthinking labour' if you're saying 'flipping burgers' is relevant and necessary to 'working hard'. The qualities just don't seem to match up for a job that requires real, rigorous, logical thinking, except for selecting out anyone incapable of the bare minimum effort to sort of just survive in the workplace. That's fair, but doesn't really map to what I commonly see which is a lot of wasted potential being consumed by menial labour because 'just doing it' is seen as more important than developing genuinely useful new approaches.
