My only set of keys to my Oldsmobile alero 2003

latch jammed damaged or debris

Use the key to unlock the back seat, release the back seat and fold it down, climb inside the trunk, and pull the trunk release lever.

do you have a key for it

if you look in the trunk for a release arm to unlock the seat back so you can fold it down.

i would try to use jumper cable under hood with power from difrent unit to energised
your car you should be able to use your remote truck acsses button

Can u get in the trunk from the back seat

First off all you need to do is remove the back speaker on the drivers side by undoing the two plastic clips that hold the speaker in place then stick your arm through the speaker hole and pull the strap inside the trunk to let the sits down then put the speaker back and your good to go.

Try looking for a strap in your trunk it should be located at the upper inside of your trunk, there could be one or two straps, when you pull on these straps they act as a release lever for your rear seats, pull the straps toward you and push the seats forward from the trunk side.

there should be a release handle on the side or the rear of the seat.

If your trunk release button is electric, and not working because you need to turn the key to give it power, remove the button and use a piece of wire to jump power to it from the battery. This will get your trunk open! (don't forget to have a spare key made)