For those of you who have read the Little House Books by Laura Ingalls Wilder, and specifically Little House on the Prairie, here is a door like Pa and Laura build in that book. See the Z timbers providing the support? See the chain that provides the locking mechanism? That is Pa and Laura. The door below is in the bathroom of our temporary "home".
This is our front door in our current rental. If you look closely, you can see that the lock mechanism is basically the same, although the door above has a key to locki it.
It also is a split door. I can open the top half for air/breeze. Lovely.