A shoeshine. Because the product sold is not a shiny shoe, a rotary brush could do that, the product sold is feeling of being above your fellow man.

Similarly, even with perfect sexbots on the market, prostitutes will still make a living. A pope will still have a job. A bartender will still have a job. Handmade nicknacks will still be a product.

With machines taking care of all utilities and practicalities, the economy of selling emotions will still remain. And much of that economy includes a human element not for any practical reason but because it's the core emotional component of the product sold.

Of course, you only need to bust your ass working in this irrational economy if you wish to consume its services. When it's important for you that a human bartender hands you your drink, not a robot one, never mind that its the same drink.

If you are content with what the machines provide and don't need the luxuries of human labour, then your cost of living will be very low indeed. The robots, after all, don't need any wages. Their labour has no cost.