Dave, 

Worst case is that you will need to remove the instrument cluster, and then remove the screws holding the digital clock.  This allows the button to pop up again.  Then, carefully re-assemble.
I'm forgetting all the details....but I had the same issue on my 85 on a cross-country trip where I reset clock when passing through time zones.  I did it in a parking lot or campsite...can't remember.  It's very very easy.  Or, like Pascal said, keep fiddling with it, maybe with some eye magnification, and maybe you will get lucky.

Your clock is good.  I will add...the lesson I learned is not to try to reset clock with a toothpick at 65 MPH!  One bump and you kinda overdo the button press and it gets lodged behind bezel.
Rich
San Diego

    On Wednesday, May 1, 2019, 3:57:49 PM PDT, pascal cousineau <pascal4cousineau@GMAIL.COM> wrote:  
 
 Dave, i have an 87 that had the same problem, take a safety pin and keep fiddling with it, 
You’ll get it eventually.
-Pascal

Sent from my iPhone

> On May 1, 2019, at 6:50 PM, Dave Weaver <busboy-nh@comcast.net> wrote:
> 
> Was setting the time on the in-dash digital clock. The minute button worked
> fine, but the hour button stuck down and won¹t release.
> 
> As a result, the hours continually cycle. Any hope for the clock or will I
> have to replace it?
> 
> Dave
> 88 Vanagon GL 2.1
> 90 Westy 2.0 TIICO