Originally Posted by InkUnderNails

Agreed. If they had bolted their door, your key should not have worked. It was they that were violated and it was their fault, and you were embarrassed. All was needless but happens.

Here is the lesson: The very first thing when you get in the room bolt the door. When you are sure you are alone and have not run in on someone, latch the security latch. The reason you do not do this first is that if you must leave quickly it can become a hindrance. The dead bolt opens with the door and you can escape quickly. The situation is very, very rare but it does happen.

As for the hotel, they should comp the room, or at the very least dinner, for your embarrassment. Points would be good if you are expensed.

And, Welcome to FlyerTalk!