R.R.
Just want to say, please NEVER underestimate the power of toddlers to figure out a way to get to a high chain like the one on your front door!
I worked in a preschool that had a chain on a door leading to the front yard, in the 2 year old class. The doorknob lock was kept unlocked during the day, and the chain latched. Having left at 4 and realizing I'd left something I needed that evening I went back, just in time to see several 2 year olds tumbling out the door as I pulled up! Their teacher and aide were tending to a hurt child and while their backs were turned the toddlers had stacked chairs, a small bookcase, and totes used to store toys, things that normally weren't near the door which they'd brought from all over the room, with the most daring child making a precarious climb to the top and unchaining the door, causing everything and everyone to tumble out when one of them opened it! One of the girls got up from the mound and began running to the gate (it was pick-up time as parents were getting off work) as she thought she saw her mother. I picked her up and carried her inside, saw the chaos with the bleeding child as they were calling 9-1-1, went into the room, retrieved more children, moved everything away from the door, locked the door and sat down to shake with all the adrenaline going through me.
We called the director that night and 2 new locks were put on the door first thing in the morning, the room rearranged so stackable items were kept out of the toddlers reach, bolted to the floor, or out of the room, a bell was hung on the door to alert teachers if a child opened it, but we were never able to get a clear picture of who thought up the idea to stack and unlock or who did what, they were all too young to reasonably question or to tell us on their own!
Thank God none of the children sustained any injuries, had they gotten to the gate and opened it they could have entered a busy intersection. But I learned that night to never underestimate the brilliance and creativity of toddlers...if they have an idea, they'll find a way to get it done!