The thing is, most humans are not doing those types of jobs for YEARS like robots. Humans can learn on the job and acquire skills and impress their boss and get raises and maybe become the boss and apply to other jobs or find something like better. That's why it's called "ground floor", because you can move up, and most people eventually do.

The % of people making minimum wage at any given time is a snapshot, and it covers people at all stages of their lives. Are there some people working their ass off and not making it a la an Upton Sinclaire book? Sure. But that's not most people. In fact, most people (1) making minimum wage are between the ages of 16-24 and aren't going to be making that forever. And even among those who aren't, most are well above the poverty line.

[1] https://www.heritage.org/jobs-and-labor/report/who-earns-the...