I have no idea why some SDNers think getting a job = doing something in food service or retail, and there's nothing wrong with working in those industries, either.
My parents paid for my tuition but it was expected that I pay for my room and board, so I took out small loans and worked various part-time jobs during high school summers and as an undergrad: camp counselor, office assistant, after-school counselor, and EMR preloader, to name a few. I worked full-time during summer and winter breaks and about 10 hours a week while in undergrad. I definitely got asked about my responsibilities working with kids and working with electronic records at a medical office was beneficial for obvious reasons. But I strongly believe the skills and perceptive I gained while employed even in non-medical positions contributed to my personal growth and consequently my application.
I still volunteered plenty and maintained a competitive GPA. No regrets.