The breaker is come up before them: they have broken up, and have passed through the gate, and are gone out by it: and their king shall pass before them, and the LORD on the head of them.

The gate wasn't unlocked. It was broken or taken off.

To Shuppim and Hosah the lot came forth westward, with the gate Shallecheth, by the causeway of the going up, ward against ward.

Then I went on to the gate of the fountain, and to the king's pool: but there was no place for the beast that was under me to pass.

And the king was much moved, and went up to the chamber over the gate, and wept: and as he went, thus he said, O my son Absalom, my son, my son Absalom! would God I had died for thee, O Absalom, my son, my son!

Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: / Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.