Why do they never open the lobby at the posted time?

As a former employee, they tend to open earlier. Usually doors are opened by 5:30 most of the time 5 AM, but they have short staff on 3rd shift.

You'd think the only person paid a living wage there would be on top of their responsibilities

Its called the manager not having their team ready and prepared, or they forgot the time because they were busy getting everthing ready