I think it’s learned for some occupations, i.e. you have your hands full, you need to push through a door because your arms are full or you’re pulling a trolley, you turn around and push with your back or leading shoulder, and then prop it with your feet, and then situational for everyone else (like kick plates on one-side of toilet doors that people will use to avoid touching the handles. I use feet preferentially on open doors rather than pushing, even sliding doors.

The kicking maggie t appeals to me