I have to pick up my car at Nashville tomorrow and my flight lands there at 11.59PM. I understand the rental closes at 11pm. How can I pick up my car ?

I would call them

Were you able to get the car after hours?

Yep same here, call them. Our flight landed after 10:30pm. By the time we were in line and able to speak to the representative, he was already saying he had to shut down the line before anyone else came.