The doors will be unlocked.
Opening locked doors in dead space.
Each time you visit that level you will need to expend a power node to open that.
Insert the pick above the wrench.
Same goes for any other door in the game.
Inside is a small button that needs to be pushed to unlock the door.
Once all pins have been moved the lock should open.
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.
Node locked doors are doors that require a power node to open.
You return to this area later in the game.
If it is locked at first you eventually return and it will be unlocked.
But get ready to blast your first real enemy remember target the limbs you may also.
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.