It use to be common for RV door locks to have a push pull button
That went straight in and out
Is that what you are talking about, there never was a handle on it
If the insides are properly lubed, it's usually not hard to pull or push unless there is substantial wear
I've had several RVs with that lock
it is not used or MFG anymore
Our current rv has a different lock it has a dead bolt with a little red handle
And another locking device for the door latch, a rod that sticks out and swings up or down in an arc
Again not hard to move
i think it has also been replaced by a newer model
I'm trying hard but (can't) picture what you are describing
And not finding pictures on Google that match what I'm thinking from your description
BUT a 1986 should have the lock in the top picture
(turned over) it is shown upside down from normal install position
i suggest you take it apart , clean with brake cleaner
and lube with something like 'teflon dry lube spray'
if this does not solve your problem, you should probably buy a NEW door lock
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s