At least you weren't trapped inside the room!

That happened to me when we were renting a house. Myself, my wife and my two kids ( age2 and 4) were in the babies room and the door closed. The knob just spun when I went to open it.

No keys, so going out the window wouldn't matter. No phones, couldn't call anyone. No tools, it was a child's room.

I ended up taking the curtain rod off it's bracket and punching a series of holes through the door in a semi circle around the knob. Eventually I got the knob to fall out.

My landlord laughed at the story and replaced all the interior knobs in the house after that.