Funny, I've had the opposite problem.

When I find a shower door I load it on the truck & bring it home.

I have an old fairly thick sheet I keep just for these. I lay the sheet flat on the back driveway and put the shower door on edge and fold the sheet up around it like a taco,



Whack with a hammer... nothing. WHACK with a hammer... nothing. WHACK with a hammer... nothing. WHACK PSHHHHHHHHHH!

Wiggle all the glass & seal strips out of the channels and savor the extruded aluminum.

All the glass stays in the sheet for easy disposal, but I always have to hit it harder than you'd think.