Why is this important?
How and why you worked help the UCs paint a better picture of you. Working to help your parents defray household costs, or to help pay for your own ACT fees and college applications show responsibility. Responsibility and contribution are important character traits. You are more likely to be responsible for yourself at college and contribute to their college community. It seems like it doesn't pay to be "privileged"; however you can be "entitled" yet manage and choose to be self-sufficient for yourself and your family needs with your paycheck.
Your afterschool job at Jamba Juice (to help your mom pay for your senior year expenses), after dragon boat practice then rushing home to finish your AP Lit assignment may seem like a personal crazy, stressful schedule. If you can handle it, your UC app is all that more strong, and will add “points” to your application.