Day 48 - Locked Away

Went for a walk after work today to the post office because I thought there would definately be people walking around there.  Well, I found someone but they didn't want their photo taken.  It put me off a little so I took the safe option and photographed the mail boxes.  Locked behind them were all the potential people I could have taken, but I needed the key.

Technical:
ISO 100
EF50mm
f/4
1/8s (handheld, what the ???)