Locked keys in trunk 1989 park ave no spare keys wh@t to do

Get a taxi home and get the spare set.

Or YouTube is full of handy tips, but it depends entirely on your vehicle make and model and how the doors lock.

Google

year make model keys locked inside
and
year make model keys locked in trunk

https://www.popalock.com/franchise/phoenix-az/local-locksmith-blog/23715-2/

and some YouTube video help

https://www.google.com/search?q=%E2%80%8Byear+make+model+keys+locked+in+trunk

Moral of the story, never open the trunk and put the keys down. Put them between your knees or your thighs if you need two hands. I guarantee you won't do it again. Good luck. Let me know how you get on please.
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If you examine the panel where the number plate light is mounted there should be a hidden key hole slot. It will be probably have seized up as it isn't normally used regularly. You might have to spray it a few times with a light releasing oil to free it up and gradually work it loose with the spare key. Don't rush this as you could snap the key or damage the lock barrel. This should give you access to the trunk without having to 'hot-wire' any of the electrics. The fault in the wiring is probably where the wires join the trunk lid from the body of the car so "Hot-wiring" probably wouldn't work.

you might try lubricating the trunk latch with a silicone spray or wd-40 and unlocking it with the key while it is open. There is a chance there is a small broken spring in the latch that is not pulling it over to full unlock position and when you tried to shut the trunk it is actually already in the locked position.

Call a lock smith. Your insurance will most likely pay for lockout service. Your other choice is to pry the lock out, and then use a large screwdriver to turn the latch, which will open the trunk.
I'd go with the first option!

There is no drain plug. For the leaks be certain to investigate: sunroof drains, taillight seals, and the trunk seal. Many trunk seals actually channel water into the trunk. New designs are available on many GMs.

There should be a trunk release switch in the vicinity of the driver seat. There also may be a manual trunk release somewhere in the back seat area. Also, you may be able to remove or fold down the rear seat thereby giving you access to the trunk.

The spare is in the hatch and is a temporary spare (donut). Open the hatch and remove the passenger side rear compartment cover by turning the three "screws" half turns to release them. The jack and other tools are mounted behind the spare.

youmight be able to get in from the back seat 1. remove bottom seat first then remove back you should be able to get to the Trunk

Try the switch inside the glove box