Look authentic and professional. Brand yourself.
Learn about the business and get to know the clerk first. Then get to know the owner and find out why they are in this business.
Don't try to sell them. Get to know them. Let it come up organically, or let them go back to work and give them a break. Reach out to them as a follow-up. Then at that point start rolling the ball toward creating a video.
Connect with Marcus and Bobby on Channels by Marco Polo.
https://channels.marcopolo.me/-/failing-filmmaker