Applied at Sam's Club for janitor

I'm an 18-year-old college student actively searching for an entry-level minimum wage job in the California OC/IE area. I've applied to around 50 positions but have only landed one interview for a janitor role at Sam's Club, which I unfortunately didn't get after they learned about my college schedule. I have previous experience working at Knott's Berry Farm and hold a food handlers card, yet I feel stuck while my friends, some without any experience, are getting hired easily. I'm starting to wonder if I'm doing something wrong with my applications or if my past termination is affecting my chances. Any advice would be greatly appreciated.