My neighbors don't know how to use the garbage chute

I live in an apartment building with a garbage chute on each floor. This is a really simple device: there's a little door on the wall with a handle. Pulling on the handle reveals a drawer, and at the back of the drawer is a long chute. When I use the chute, I open the drawer, place my garbage bag inside, and close the drawer again, listening happily to the sound of my trash crashing in the dumpster below.

It no longer surprises me that whenever I stroll over to the garbage chute with a Hefty bag of trash, I find the drawer sitting open with someone else's garbage in it. Apparently closing the drawer is too much effort for my neighbors.