So sorry to hear about what you've been going thru sledge, but I do hope that the treatment has been successful and that you're now on the 'Up and getting past it all' stage! Not that it ever really fully 'goes away' once you've been hit with this sorta stuff, but I do hope that at least you'll be able to get back to some semblance of your previous life & can enjoy things again. :thumbup:
As for your seat, check out the pics below. With any luck, you can see how the latch activation arm, where the cable attaches, needs to be moved/pulled toward the front of the Spyder to release the seat locking pin. If they don't already have an 'emergency release cable' fitted, some have managed to (after padding both the tupperware & the seat to avoid doing any damage!) snake a piece of stiff wire with a hook bent into the end of it up into that area and then been able to hook onto the lever arm to pull it forwards, doing that while pressing down on the seat pad to make it easier to release...

. IIRC, the piece of wire needs to go up from the bottom edge of the seat just
behind the join in those two panels you can see in the 'closed seat' pic, then once you can feel that the wire's reached up as far as the lever arm (it won't go much further due to the frame/main spar) it needs to turn & pull down to hook onto the lever arm, then pull forwards. It's usually frustrating as all **** to get the bend & hook in the wire juuuust right first, then even more f****** frustrating to hook the lever, but it can and has been done by a fair few!

hyea:
However, I suspect that cos it hasn't been used for a while, your seat release mechanism &/or the latch/lever itself have just dried out and jammed onto the seat locking pin; so before you go quite as far as the frustrating bent piece thing, what do you feel on the key when you press down/in on it before you turn it clockwise to release the seat (instead of anti-clockwise to release the frunk

)?? Does it feel as tho there's still any resistance or pull on the cable?? If it's still doing that, instead of just turning freely without
ANY resistance from the cable (indicating the cable or one of its ends are likely broken), then the cable is probably still connected and working, just not far enough/hard enough to move the lever arm enough to release the seat locking pin, and in
THAT case, you might want to try spraying something like contact cleaner, brake kleen, or maybe even WD40 into the latch area under the seat in the hope of cleaning/lubing the release lever & latch enough to let it work, but even if it does work to free up the release mechanism, you'll still have the potential of a jammed/stuck seat locking pin in or to the latch! So you'll very likely need some fairly significant downwards pressure on the seat above the latch area in order to let it release as you activate/turn the key, then once you have turned and while still holding the key turned, pull upwards on the seat edge nearest the latch.
And once you
DO get it open, lube it well; but also fit up an emergency release cable before you close it again! :lecturef_smilie: I reckon there's a few albums showing this, and quite a few threads/posts discussing how to do it on the Forum. :thumbup:
Good Luck, and Good Health too! :2thumbs: