Whats the best way to ask for time to consider a job offer?

I have my second ever job interview tomorrow for a food service job that I have heard often hires on spot, however I have an interview for a retail job I would much rather prefer on Friday. How would I go about asking for some time before accepting without sounding like I’m disinterested. I would rather have a job than no job.

Sorry if the flair isnt fitting I was unsure whether to put job offers, searching, or interviews.

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official