The closing shift is where you find out who actually cares about the job.

At the end of the night nobody is watching, the customers are gone and the corners are easy to skip. What you do then is a fair measure of your standards, because there is no audience and no immediate reward. People reveal themselves in the unsupervised hour rather than the busy one. That holds for your own view of yourself as much as for anybody else.

Take one closing shift and work to the standard you would keep if your manager were standing there. See how long the extra care actually takes. Watch who else does it, because those are the people worth learning from.