Locking them up at night is the way to go as you never know what will come over the fence.
Extend the wire so foxes cannot did into the pen. If you have a tree overhanging the woodshed make sure it cannot be gotten into that way. Foxes etc have been known to climb trees to get into chook pens.
We used to give our chooks all kitchen scraps.
Have fun and enjoy fresh eggs, how I miss that. We cannot have chooks as we have a Jack Russell