Daymare: 1998

The first very hard lock to hack is found on chapter 2. After obtaining the cutters from the closet on the 2F of the hospital you will be attacked by 3 zombies who have opened a brand new room for you to explore. In this new room there is a locker with a very hard lock to hack. This is not the only one in the game but it is the first one you can come across. Below is a video containing the location of the lock at 12:52.