That's how they work

But what if it's locked?

Thanks, Captain Obvious.

This is oddly inspirational.

Then wedge the heaviest door stop you can find in front of it, even if it's a 100 pound boulder. When the door's open there is no requirement to walk in, you can slide, tumble, quarterback dive, or backward roll. It doesn't matter how you enter, it is life and it is good.