Thats tough if you dont have the persuasion skill, i just kill the two raiders in the first part, it might take a couple tries. i survived with 6 hp on one play through. Some times if you antagonize them by telling them you killed their buddy, only one will attack, although thats not always the case. If you have strong psi abilities they are easy, just stun one of them.
Also be careful to make a save you can revert to, my latest character failed that quest for some reason, the key was in my posession but the game refused to acknowledge it, I was forced to lvl outside and use persuasion to close the quest with a failed to find a means to open the door mark.
That quest needs some work imo, you are forced to kill those two or you die if you don't have the intimidation skill or the hp to survive the many free shots on you. Of course its quite doable as you can generally survive the freeshots on you from the two initial raiders.
Great game tho =)