The door needed only a push to open it.

In the hay-loft above he heard a man snoring.

Mr.Wogan did not think it worth while to disturb him.

He saddled his horse, walked it out into the yard, mounted, and rode quietly away.
He had escaped, but without much credit to himself.
"There was no key in the door," he thought.

"I should have noticed it.
Misset, the man of resources, would have tilted a chair backwards against that door with its top bar wedged beneath the door handle." Certainly Wogan needed Misset if he was to succeed in his endeavour.