"Emergency Exit" or "Other Door"

Left Silverton a couple days ago, the snow was getting heavier on the peaks surrounding camp and I had a couple of 11,000 ft passes to pull the trailer over. Then the local dog sled groups started training sled dogs using sleds with wheels on them on the road past camp. Maybe they know something. Camped one night in the Dolores Valley and one night in Cortez so I could get to Shiprock to photo at sunrise then headed west.
Have not been able to find a wi-fi spot the last couple days so stopped at a McDonalds for a coke as they always have wi-fi. It was a small store with a big room with lots of windows attached. I was able to check my emails so went to leave. There were two doors going to the parking lot right in front of my van. Tossed the cup in the trash right by the door then noticed the door had a sign "emergency exit please use other door". turned to the other door and it had the same sign. At that point figured that I was in the sequel to the "Truman Show" or on some desert "Candid Camera" after all the name of the town was Tuba City, who names a real town Tuba City. So which door was the "emergency exit" and which was the "other door". Tried the first one and the alarm went off. Dam, wrong door. Tried the next door and another alarm went off. It seems you must go back into the other room and exit by the counter. You pay for your drink before you get it so there is no danger of someone skipping out without paying, I guess they are having a problem with theft of trays or something. Later I realized neither of the doors opened, they were both locked, so how do you get out in an emergency.