Shed Door Retainer - What Took So Long?

This is a simple solution to the problem of a tool shed door that would not stay open.  After a couple of years of propping it open with rocks and bricks, and getting trapped in the dark when the wind blew it shut, I found a solution.

DUH!  Put a hook on the fence rail and the eye on the door.  Latch it open!  What took me so long, I think, is that the solution was so simple. 

Yes, it's a hook and eye!

The other shed is further from the fence, so I bent skinny steel rod into an 18-inch hook.  Chain and a hook to connect between the shed door and the fence would also have worked, but I had the rod in the workshop and no chain.