I went to a local bike shop to ask if I could use a pump since my front tire was super low after I got out of work and I wanted to avoid using my co2 and as I came into the store I asked the dude behind the desk politely if I could use a pump or air, he gave me a weird look and said no, we sell pumps...

I've never had issues with a shop letting me use air, even some tools like lock ring pliers. Dudes have been nice so I come back and buy stuff **** that shop though.