Hi,
I saw that you already have a handle mesh as a component.
So you just need to make sure the pivot is correct of the handle and then you could use the timeline node again or a new timeline node and set/update the rotation of the handle. You already have the boolean for Locked so if the door is locked it should only play/update the handle (I guess).
Check the image.
(If the door handle should always rotate you could use a sequence node after the Sound lock off and connect pin 1 to the new time line and pin 2 to the current flow)
hope that helps 