Opening door?? any ideas

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Wow I feel like a bum asking this but does anybody have an Idea how to open my passenger side door on my 77 K10? The button on the outside will not push in all the way. Same from the inside. I have tried pushing on the door and attempting to push the button and I have also tried pulling and pushing the button. I also have tried the same from the inside of the truck. It is not locked and the lock moved fin up and down. It feels like the button is not going in al the way. WE tried used a broom handle to put extra force on the button but no dice. Because it is closed I can't get the door panal off to get to the guts. It is 15 out right now and Any tricks or tips would be very helpful. It has never done this before. There is a hole for a speaker in the door panal but I cannot see in side the panal at what i am doing and I am not sure if my arm can reach that far.

Thanks for any tips or tricks.