It sounds like you are mistaking the logic of how NPC's open doors. The door itself will only be opened by a trigger of some kind (probably a multimanager). What you will need to do is place another trigger that the player will activate (hitting a button, walking within a certain proximity of the door, it's up to you), which then calls your multimanager which plays the scripted sequence of the barney walking up to the retinal scanner, plays the desired animation, which then in turn triggers the door.