Sometimes kids may hang on the door and miss align the door and you have difficulties opening it.
Here is a simple way to fix it.
Step 1: Tools
Phillips screwdriver (size and type depends on screws)
I use one in the photo. it is hard to remove the screw.
Step 2: How To..
If you loose screw A the door will change as shown in fig A.2
By loosening the screw and adjusting the door you can level as shown in fig B.