I've been kicked out of a muni airport terminal because the TSOs at the checkpoint wanted to take a break. They said they couldn't guard the terminal anymore so everyone inside had to leave and get rescreened when break time was over.

It was all kind of a farce as I ended up back in the same airport later that night; a depressurization caused my plane to return. By that time TSA had gone home so my fellow passengers and I were free to enter/exit the terminal at will while we waited several hours for a back-up plane. There was one local cop that would poke his head inside every hour or so to see if we'd left so he could lock up the place.