Update to my storage unit adventure:
Looks like I was wrong to have left the location without accessing the unit. I have been told that a normal customer would have contacted customer service. There was an option to rent the unit via phone, but the instructions said that the shopper had the option of initiating the rental process via phone, QR code, or kiosk. I chose the QR code because I didn't want the hassle of talking to someone. I would have had the problem regardless of which rental option I chose, but apparently, I should have attempted to rectify the situation.
Nowhere in the instructions did it indicate that I should attempt to contact customer service if the unit could not be accessed. The shop will now be sent to the reviewers, I'm not optimistic as to how that will come out. My only hope now is that I can get my refund for the rental.
Lesson here is that these shops appear to be very easy, until something goes wrong.