There are several countries with a Mandatory Military Service. Some of the terms are fairly short with a requirement of only 6 months.
Take that concept and apply it to service industry work.
Imagine if everyone in society had to have at least one retail or food service job before they were issued a driver’s license or allowed to be employed in another job. Even wealthy people would be required to do this with no loopholes or ways to buy their way out of it.
I think this would teach empathy for many. Of course, there would always be some who would not learn anything but it would definitely change some people.
Also, some judges are already doing this as punishment for bad behavior.
I’ve known plenty of people who worked retail that are shitty people and treat others like shit too. It’s just a personality type.