How hard is it to close a door?

I don’t know maybe it’s just me who learned how to close the damn front door when I was 2 years old. But my husband no matter how many times I tell him close the door will walk outside or even leave in his car and just leave the front door wide open with out a care in the world. It’s like he is just inviting all the bugs, spiders, snakes, mice, robbers, and serial killers right in! So how hard is it to close a damn door?