It doesn't necessarily need to. Someone circa ~2005 might have said that you can't automate a grocery cashier/bagger, because a robot would have a tough time orienting barcodes towards a scanner and bagging groceries without wrecking them. Turns out a lot of people are fine scanning and bagging their own groceries. You only had to make a better UI for the register, and add enough security to convince corporate that people weren't stealing too much. People would probably be fine walking to the end of their driveway to pick their package out of a small delivery bot.

An alternative that I thought of a while back would be to have a delivery truck with a bunch of drones. The truck parks when it gets to a neighborhood, and drones ferry packages to doorsteps.

Even if you just cut out delivery jobs with something like the above in suburban and rural areas, that's still a lot of jobs.