What is the padlock used for?

[Kedjane]

At first I thought you could re-lock the starting locker, or use it in some door in the game (I havn't tried that, but since noone else sais anything I'm guessing it's the impossible).
I think it will be used for something in Episode 2 or 3. The last big monster boss approaches, one hit and you're dead and you can't find any way to kill it. The only thing in your inventory is the lockpad (The only thing the cyber-weapon-stripper-from-half-life didn't take from you). You throw it at the monster, it erupts in flames, the ground trembles and opens up and the monster falls down to its infernal death.