Where should I try to get a job? 15 years old?

Hey I've been looking around trying to find a job online and most places require me to be at least 16 years of age... Where can I work this summer (at a business, not mowing lawns or babysitting) that will let me work because of my age? I already opened an application to white castle but should I open another one to mcdonalds in case I don't get called for an interview? Thanks