Brick and mortar retail jobs in the U.S. collapsed in the late twenty-teens. Whose employment was affected?
It is tricky to figure out because ex-retail workers don't have excessive rates of unemployment.
According to Wonkblog at the Washington Post, the main casualties were people who would otherwise have entered the workforce for the first time in retail and as a result did not.
Fortunately, since other industries like Uber driving and food service were growing at the same time that retail has been collapsing, this has mostly meant that young people entering the work force for the first time end up on a different career path rather than resulting in serious youth unemployment.