What Kind of Lubricant for Door Handles?

So I can't seem to find the answer to this anywhere. What kind of lubricant is used to lube the travels on the car door handles?

When I first got the car years ago, pulling on the handle was smooth and graceful. Now it is stiff and rough. It is like it has to break some surface tension before it finally gives and then that results in yanking it until it reaches its maximum pull. Pulling the handle shows some sort of yellow pasty substance. It looks dry but upon the touch, it is greasy. I asked the dealership if they could look into it for me because they say they lube moving parts on services. When I heard back from my service rep, he said that the dealership has no involvement in lubricating the doors. 'The car comes like that from the factory but the technicians have nothing for it here but really any kind will do.'

As I don't believe in a miracle substance, simply looking up different types of lubricants will yield that each kind has a different purpose. It's hard to tell, but it looks like the handle pulls are plastic but I would believe they are metal.

I was just wondering if anyone had any insight on with what and how to treat these handles.

Thanks