How to design the broken door?

This door is broken. You can write a note on white paper and stick it next to it or put a note next to it to guide you. After the door is broken, it is inconvenient to pass. You need to print or hand-write a reminder and stick it on the side, or place an item to remind people who need to go through this door to choose other doors to enter and exit, so as to avoid people not knowing the situation and wasting time.