Want help setting up pathfinding for AI character

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How do I…

I want to make an AI costumer for my unreleased supermarket simulator game. I want him to pass from all shelfs (stay on each one for a second) and also don’t want the customer to pass through walls or shelfs

What is the expected result

When the game is run, once you open your market a costumer comes after some seconds and browse the shop. If they find something, they come to the cash register

What is the actual result

The character doesn’t move.

Related screenshots

I haven’t made any code because I haven’t set it up

Project files (optional)

Insert a minimal game showing your issue in a .zip or .rar.