How does it benefit the low end worker, by keeping minimum wage so low one can't possibly live off it?

If you still need Government assistence to put food on the table at the end of the pay week, why bother going to work at all?
Is there any benefit at all for the worker?
Now some will say these type jobs are just stepping stone jobs for the youth to get into the job market, while that was probably true twenty some years ago, it isn’t the case today seeing older and older people in these type jobs.
So I ask again is there any benefit for the low end worker by keeping minimum wage low?