'Locked' in the Bible

Now when he had gone, the king's servants came, and saw that the doors of the summer-house were locked; and they said, It may be that he is in his summer-house for a private purpose.

And news was given to Saul that David had come to Keilah. And Saul said, Now God has given him into my hands; for by going into a walled town with locked doors, he has let himself be shut in.

Then he gave a cry to the servant who was waiting on him and said, Put this woman out, and let the door be locked after her.

And I said to them, Do not let the doors of Jerusalem be open till the sun is high; and while the watchmen are in their places, let the doors be shut and locked: and let the people of Jerusalem be put on watch, every one in his watch, opposite his house.

A brother wounded is like a strong town, and violent acts are like a locked tower.

And put him into the great deep, and it was shut and locked over him, so that he might put the nations in error no longer, till the thousand years were ended: after this he will be let loose for a little time.