Door handle does not fully retract bolt from box in door frame

A handy person from Greenwood, SC says:
July 7, 2017
When pressed fully down the door handle does not does not fully retract the bolt from the box in the door frame. The latch extends about 1/8" beyond the plate on the door. This is enough to prevent the door from opening without a very hard jerk. The problem is the same whether opening the door from the inside or the outside. Any suggestions for making the necessary adjustment.

Thanks.
User submitted photos of door hardware.
Profile picture of Tom
Tom from SWISCO responded:
July 12, 2017
It sounds like a problem with the inside mortise lock. It's possible the spring inside is broken. A good way to test this is to remove the handles from the door and then try to throw the mortise manually, like with a screwdriver. If the problem persists, then that's your culprit.
Brass Atrium Door Lever Lockset
Brass Atrium Door Lever Lockset
82-400
$101.70
How to maintain a sliding glass door
How to maintain a sliding glass door
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.