Gd evening!!

Just a quick piece of advice please if someone could help?

Spotted a potential date at my local Sainsbury's - She works in the chemist. I've chatted to her a few times when i've asked for her advice and 'bought' something. She has given me a couple of IOI's, laughing / smiling and playing with her hair etc. . .
My only problem now is I don't know how to ask her for her number / close or take the next step - whatever that will be!
Please help and I'll give it a go and let you know!
Cheers
G