Some kids got into trouble when they visited Freddy Fazbear's Pizzeria in Five Night at Freddy's: Into The Pit. You'll have to save many of them as you search the pizzeria to find your father, and one kid goes missing when you enter the security room.
Distract the creature and find the child in the freezer: FNAF Into the Pit
You’ll have to explore the haunted pizzeria and avoid dangerous animatronics to save these children. It’ll put your life in danger, but if you want to save your father, it comes down to saving as many of these kids as you can along the way. Here’s what you need to know about finding the missing child and getting him out of the freezer in FNAF: Into The Pit.
Shortly after checking the cameras and distracting the creatures in Freddy Fazbear's Pizzeria, the child in the security room has disappeared. It doesn't tell you where he went, and you'll have to explore the dangerous pizzeria to find him. Luckily, since you had to check the cameras before you could proceed, it showed you an animatronic leading the child away from the Party Hallway to the Kitchen. You can follow the same path from the Security office to the Kitchen to track them down.
When you get to the kitchen, the kid is locked in the freezer. Unfortunately, the screwdriver isn't a useful item here. You'll need to find a new one, and it's not one that requires you to travel through the ball pit to find. Instead, it's in the arcade. Head to the northwest side of Freddy Fazbear's Pizzeria and approach the arcade machine with the hammer attached to it. You can interact with the hammer to remove it from the game and take it with you. It's great for smashing things and perfect for cracking open the freezer.