Small dog aggression problems with people

Filed in - papillon - dog - biting - aggression - growling

Help!! Can this clicker method help me train my "harmless" 7 lb dog to stop getting aggressive towards strangers and biting them? actually not only strangers but also her owners when they try to take her food away or move her from a comfortable spot.  Recently when my husband got up suddenly while she was sitting calmly by his feet, she got startled or I don't know what and lunged at hima and bit his hand.

 She's healthy and she's 5 years old.  Maybe she's too old for this method?  I notice the book on "calm your dog" by Emma but it seems to be a book geared towards aggression to other dogs- I want to stop her from biting people!!!

 If anyone can help it would be appreciated!!