How do I ask this girl out

I was with my friend going downtown of where I live, and I went into this store and saw the prettiest girl ever, I don’t ever go out to ask girls out or talk to them I find it quite awkward and weird. But she is genuinely so pretty I would hate to not ask. I am thinking of going into the store again (it’s a candy/sweets sweets store idk if this helps) and maybe just asking her for her number. Pls help lol