[laverdur]

My door latch became hard to operate and it was hard to close the door without slamming it. I pulled the whole lock assembly out, took it apart, cleaned it up with Brakleen and then lubed it with Disk brake caliper synthetic grease. Problem solved. A little white lithium grease on the latch and striker plate also helps. Sybthetic brake grease was the lube of choice because it stays soft at cold temps and does not melt and flow at high temps.