You hoist your gear on your back and grab a sturdy looking..... pole weapon, it has far too many prongs to be called a spear.
You pull the door closed and drive the weapon through the handle and the door frame.
It won't hold forever but should buy you
You quickly move on, the tunnel rises upwards for a while then plateaus, you come to a fork. There are tracks leading to and from both forks. The air flow doesn't offer any clues either.
You remember the fateful choice that led you to the village