Some schools weight part time work heavily in the admission process. Some not at all. Check each school’s CDS.
Pay to play can help students decide a career path but most likely won’t move the admissions needle. S21 did one in high school. Great experience for him but I don’t think it helped him at all with admissions.
He also did an unpaid intern at a startup after freshman year. Another great experience and I’m pretty sure it’s helped him land other internships and gigs. The best way to learn how to work is get a job. Any job.