Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Sentence: A new issue is growing out of labor ' s drive for a higher minimum wage for fast - food employees : wage theft , an umbrella term for failing to pay workers what they ' re legally owed .<sep>Span: what they ' re legally owed
How are fast-food establishments not paying what workers are legally owed?