Hall of Infinite Doors

You search through the closet more carefully to see if you can find anything unique or interested. You notice to the corner of the room a scrap of paper. Scrawled on it in messy hand writing is the following message:

"Do not remove any cleaning supplies from the closet unless you have proper authority. Furthermore consumption of this note is lethal, as it has been inked with the venom of a black mamba. Have a nice day."

What do you do?