Just to close the loop on this one, We arrived at the elevator at around 10:00 am on Saturday. The sign was up indicating no Priority Pass access. We went up anyway and the woman at the desk said that it would no problem to let me in using my Priority Pass since I was accompanying a minor. So, we went in and spend a nice hour in this lounge. Note that I was (of course) extremely nice to the woman behind the counter, didn't demand anything, and listened to her directions.
Thanks for everyone's help!