The hardest thing about closing the door is watching the silver lining drift to the floor, ground to dust and swept under the rug, floors are much quicker to let bygones be.
The hardest thing about closing the door is the screech of hinges boring through skull like worried whispers heard before that made the iron oxidize.
The hardest thing is clicking the lock and seeing both keys on the table top,
then clicking your heels but you're already home, just seeing how empty it is on your own.