The door is about to fall, what kind of warning should I post?

This door is broken.

Post a big notice to tell others that the door is broken. Please pay attention to safety, do not touch it, or take a detour. We are speeding up repairs for everyone's safety.

The door is the only place that people must pass in and out of the house, and by extension it is also a pathway. The gate is usually built in the house of a family, which is extended to the family name, family, and also to different sects and categories, especially the different groups and sects in religion and academic aspects.