Fob button is not popping, repair ?

Open button on my fob stopped working, it's kinda stuck, no popping ,can't push it.
Puzzling how I can open /or break??!!/ this housing, after taking out battery I still don't see any screws/fixture that allows me to dissamble it. There is a tight seam in the middle and look like it glued together..

Anybody try to do this? I want to check underneath that button probably some rubber spring on circuit that need to be changed, or to change the whole housing ??

All electronic works OK on my FOB, I can use it remotely, just that stuck button

Thansk
Mario

 

Tx, JC, I got an idea.
I think electronic housing is hot melted together, I tried to carefully blade to separate but not avail.

M

 

Tx, all
there is NO problem to replace battery, here is super video and it's very easy:
How to Replace the Battery in a Toyota Prius Key Fob - Snapguide

However to get into circuit / switch/button area we need more breakage, and I stopped on this. I don't think it's snapped, no screws, d'be just melted.
I go with JC91006 recommendation, will just find good blade.
I think his dog can do this easely

Ma

Hey all !!!
Case is solved , you can pry gently this flexy-rubberish cover over buttons, which is on other side from Toyota logo, starting from LOCK button, it go quite easy, this is still rubber that has snapping/grooving profile, so after examining my button and taking on plastic chip that blocked area I just snapped it back and it's worked OK, nothing else needed. at the end it might be bit loose, then you can use bit glue.

One more time I'm talking about rubber/sh/ cover over those 3 buttons. Battery is different and it's on other side.

I used just tip of sharp knife for this.

M