Trump locked out of White House after accidentally revoking his own security clearance.
WASHINGTON—Growing increasingly flustered while impotently pounding on the front door and pleading to come inside, President Trump was reportedly locked out of the White House Thursday after accidentally revoking his own security clearance.
“C’mon, just open the door, guys! I didn’t mean to strip myself of access to classified information and restricted areas,” said Trump, who was forbidden from entering the premises after unwittingly writing his name on the list of individuals having their clearances revoked, thinking it was where he was supposed to place his signature. “Please, I’m sorry! I really wanna come back inside. It was an honest mistake. Oh, no, it’s starting to rain.”
At press time, Trump pressed his face up and tapped on the window of the Oval Office, prompting John Kelly to pull down the blinds.
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Poor Gerald Ford found himself accidentally locked out one night in his robe and slippers when he got up to take the family dog - Liberty - outside. 
President Ford and Liberty Get Locked Out of the White House
(from Mrs. Ford's memoir The Times of My Life (Harper & Row, 1978), pp. 241-242)
But, with motherhood imminent, we were afraid she'd [Liberty] deliver at night, so we moved her inside, and for a short while she slept on the third floor with a trainer. One night the trainer had to be away, and he left Liberty with us. "If she wants to go out," he said, "she'll come and lick your face."
About three o'clock in the morning, she came and licked Jerry's [President Ford] face. Like a good daddy, he got up, pulled on a robe and slippers, took the dog downstairs and out onto the south lawn. When they were ready to come back, Jerry rang for the elevator. But at night the elevator goes off - You have to get it charged up or something. Secret Service agents are in a room in the basement (they have a mirror and closed-circuit TV and there are lights all over the grounds), and usually they notice anything that moves, so I still don't understand how they missed the scene with the odd couple. Maybe somebody dozed off.
Anyway, Jerry decided to try the stairs. He opened the door to the stairwell, said, "Come on, Liberty," and up they climbed to the second floor, Liberty waddling from side to side, her stomach with nine puppies in it practically hanging on the ground. They got to the second floor, and the door to the hall was locked. You can get out, but you can't get back in. They went up again, to the third floor. Also locked. And there they were, a President and his dog, wandering around in a stairwell in the wee small hours of the morning, not able to get back to bed. Finally they came all the way down again, and by that time the Secret Service had been alerted, and somebody got the elevator started.
https://www.fordlibrarymuseum.gov/grf/pets2.asp
