'Locked' in the Bible

Ehud was gone when Eglon’s servants came in. They looked and found the doors of the upstairs room locked and thought he was relieving himself in the cool room.

There was a strong tower inside the city, and all the men, women, and lords of the city fled there. They locked themselves in and went up to the roof of the tower.

My sister, my bride, you are a locked garden—a locked garden and a sealed spring.