Battery dead power locks ? keys locked inside No spare key any suggestions..? 1996 Trooper LS

You can recharge the battery from underneath using a battery charger, red lead to the big wire on the starter and the black wire on a clean bolt or body part.

What about your spare keys? They come with 2 or 3.

Then once it is charged, use and inflatable airbag and open the door a little.

https://www.google.com/search?q=porsche+cayenne+keys+locked+in+car

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The key lock cylinder operates the ignition switch sometimes ignition switch is separate sorry I didn't find where ignition switch is located if the lock cylinder is plugged into it.
You should have a starter relay and starter relay fuse.
This diagram of starter circuit shows the clutch pedal switch in the circuit on an automatic should have the neutral safety switch in the circuit. This is for 95 Rodeo.
Stater Motor Circuit Diagram (1995-1997 2.6L Isuzu Rodeo) (easyautodiagnostics.com)

How do I remove the key ignition cylinder? ' Isuzu SUV Forum (planetisuzoo.com)
Isuzu Trooper Ignition Switch Replacement ' Cost & Service ' RepairSmith
Changing the Ignition Lock: Changing the Ignition Lock, Safley ... (2carpros.com)
Starter and solenoid
Isuzu Trooper Starter replace under 1 Hour - YouTube
Isuzu Trooper (1995 - 1996) - fuse box diagram - Auto Genius
Starting System & Wiring Diagram - YouTube

locks jammed , remove door card skins,and unjam it
is lock frozen with ice,
its 86f here, nice
but we cant see you ,car or where you are at.

The only thing I can think of is that this make uses an electric lock actuator and the key just turns on a switch, with no battery power no lock action.

First, the key"fob" has a battery inside. Any parts store should be able to help you replace it. Second, you should be able to insert the key into the door lock to manually unlock door. If car's battery is dead, most doors will let you insert the key and turn as far as it goes, Then operate the door handle and turn the key a bit more to unlock it.

use the interior lock button to lock boot , get out of vehicle and lock doors with the key

remove the rear seat ; if needed; crawl to the back of the hatch and release the hatch lock from inside using a blade screwdriver or, have a locksmith at the dealer make a new key by code using your vin number

put a new battery in remote,try key in other door," are you sure the car battery is not dead," !!!! If it is then remote wont work, if you are locked out of car call wrecker or lock smith and they can slim jim the door to get you inside. then unlock doors USING THE POWER LOCK button PROVIDING CAR BATTERY IS NOT DEAD!!!!

Any chance the batteries are dead in both of them? There's a little light on your key fob. Try locking/unlocking and watch the light (it's red) if it's dim or not lighting up then your battery (inside your key fob) is dead. They take CR2032 watch batteries.

slim jim or call tow truck or locksmith