This formerly straight bar that functioned as a locking mechanism used to fit into the track of this sliding glass door. However, lacking a clear handle with which it could be closed, the employees of this restaurant began shutting the glass door by using their foot to push against the locking mechanism.

Fast forward through years of this practice being adopted by and
passed down through successive employees, and the bars on both 
floor-level sliding glass doors have been bent, reflecting the passage of time, the strength of learning by observation, and the
repurposing of a locking mechanism into a higher priority function. 
Convenient and quick access has trumped security, as this lock is no longer functional in its original intended design, but through repeated use in an unexpected way has grown into its updated function
quite nicely.