I have a Cole Sewell storm door with a full pane that swaps out between glass and screen. This year, the glass has warped slightly--one of the joints is slightly expanded, enough that we can't get the glass out of the door frame. It's very tight but I'm afraid to force it out as I don't want to break the glass.
Glass does not warp. Most likely either the frame or door has warped, or the glass was not placed into it properly. It would take a lot of force to break tempered glass, unless you hit it sharp on the edge, then it breaks into millions of little pieces.