I grew up not far from Downey and that store. We had a brand new McDonalds on our main boulevard. It was a favorite teen hangout.
The workers then, were other teens, not adults expecting to support families. Teens work to support cars, dates, school expenses.
But now in most fast food places that I visit, the workers seem to be mostly minorities, some times with poor English skills. Most local teens don't work at all, or at least don't work in fast food stores.
I just heard a discussion on local Lost Angeles AM radio this AM, and they discussed how automation will displace workers, regardless of the wage level. They also pointed out that Seattle with the $15 minimum wage has NOT seen the predicted problems.