For dead space on the xbox 360 a gamefaqs q a question titled okay how do you unlock the locked doors lockers and bins.
Opening locked doors in dead space.
Insert the pick above the wrench.
Once all pins have been moved the lock should open.
You return to this area later in the game.
But get ready to blast your first real enemy remember target the limbs you may also.
Use the leg of the pick to find and push each pin up and out of the tumbler.
The non locking side of the door should have a small hole likely on the face of the knob.
Same goes for any other door in the game.
If it is locked at first you eventually return and it will be unlocked.
Each time you visit that level you will need to expend a power node to open that.
With your weapon in hand use a melee attack on the generator to the right of the locked door to open the way.
You simply need a straight stiff.
Dead space 2 wiki guide.
As previously noted this skill takes a lot of practice to master so have plenty of cheap practice locks on hand if you hope to get good at it.