As far as I know, Panera is a no-go for OC. Heres a letter I found:
Thank you for contacting Panera Bread concerning firearms in our cafes. Because we are required to follow local ordinances, which may vary in each area, we have no formal written policy regarding firearms in the bakery-cafes at this time.
However, as a place of public gathering, we are concerned about the health and safety of our customers and associates. Therefore, if a situation arises with someone in the cafe carrying firearms, we ask that customers communicate their concern to the café General Manager or the Manager on duty so that the issue can be addressed immediately.
We want each of our bakery-cafes to be a warm, welcoming environment where customers like you can enjoy a relaxing meal.
Thank you again for contacting us. We value your comments and appreciate your business.
Sincerely,