[header] How to childproof a garage [title] Install a lock on the interior door that leads to your garage. [step] By securing access from your house to the garage, you will be able to control whether or not your children enter the garage. [substeps] Use a knob lock with a doorknob cover. 
After you have installed a standard knob lock, you should install a doorknob cover so that your children cannot open it. This is a nice solution for the door between the interior of the house and the garage.