That's not the case at all. It's very cost-ineffective to automate low-skill jobs because the human capital has historically been extremely cheap. There's a reason we don't broadly have robots cleaning our houses, landscaping our yards, providing in-home care, picking fresh produce, or providing general construction labor.
It's the precisely the lack of these low-skill workers that will drive the necessity of automation, because the cost of hiring people will become too expensive.
Quartz published a well-research article last year on the same topic: "Low-skill workers aren’t actually the ones most threatened by robots" https://qz.com/1010831/the-middle-skill-job-is-disappearing-...