Do not use their online appointment system. I selected an appointment for state inspection and was given a 6:00 p.m. appointment time (they are open until 8:00 p.m. on Saturdays). Drove all the way out there and was on time for my 6:00 p.m. appointment.
I had to wait for them to deal with some customers who were complaining, but when I was finally served, they said their inspector leaves at 5:00 p.m.
Nonetheless, they said, I was in luck because he was still there. They went and talked to him, and came back and said "nevermind, he doesn't want to inspect any more cars today."
I went down the street to Jiffy Lube who literally inspected my car in 5 minutes - and stayed open late for me to do it.