Who in their right mind would lock a baby in a closet all night? I could see if there was a gate in the doorway but with the door closed??? That is just nuts. I would go to day care and forget about letting them watch your baby...ever!!! The poor baby
You have every right to be furious. You are more controlled than me because I would have flipped out!!!!
Just give him lots of love and hugs and I'm sure he will be fine. But please don't leave him there again.