I arrived with groceries (lesson learned) and could not get the door open. I texted the contact number and the gentleman was kind, asking me to try a number of codes - nothing worked. He said someone would get back to me. 2 hours later I still had not heard from anyone. I eventually got in, and the man who came to look at the lock said it was a very tricky lock. If you know a lock is 'tricky,' why do you continue to use it? Other than that, all was fine.