One of the things that shocks me the most about the workplace is how committed some people are to extracting labour out of you for mere dollars above minimum wage if not minimum wage. You did a good job and did all your work? Great, here's some more work. Did all of that? Please bust out the spray bottle and wash the walls.
It feels insulting, rude, and humiliating. If I work hard and do a good job, why insult me by giving me more labour just to extract extra value? The reward for hard & fast work should be a break and a pat on the back, not the expectation that you do even more. It's insulting and unacceptable.