We've done this twice in the last year. They were pretty strict on the 5:00. We had to drive a few minutes after we were turned away about 5 minutes before one night. We also had to show proof of DVC membership. I know at least once they also checked to ensure we were staying at a DVC resort on points. Your experience may vary depending on who the guard is that's on duty.
The elevator to the lounge is not unlocked until 6:00, so if you get there at 5:00 you'll need to find something to do for an hour.
We really enjoyed the "Seven-Lair Cake" as well as "The Lion's Uncle" drink (orange sherbet, Sprite, and grenadine) while we waited in the lounge for fireworks to start. It makes for a very relaxing evening.
View attachment 860988View attachment 860987