Well, back in the old days when I used to install some 486 processors (an huge 486 DX2 66 Mhz blast machine 🙂), there was no zif socket, in the early days, that is.
Sometime it would get harder to get the CPU out, so I CAREFULLY used one of those plates from the back of the computer (the ones you have where no PCI card is installed), and carefully lift a bit from each side, around the processor. That allways got me those hard processors out of the socket.
Just don't lift too much at a time, so you don't break the processor, or bend any pin. Just treat it like a women 😀
Well, those were the old days, anyway ...
(I'm just assuming that the only thing that keeps holding the CPU is the socket itself)
... you can always use an hammer 😀.