how can i open my trunk to my 1995 oldsmobile cutlass ciera?

if u try it this way it will require some labor but if uve got speakers in the back try taking off the back dash and then taking out a speaker (probly only need a screw driver). This should give you a speaker sized hole to get ur keys out (maybe attach a magnet to a stick or something)

if you can get into the front of the car you can remove the back seat and reach through into the trunk

I own a shop, and have seen this a few times. You will have to remove the back seat. Start with the bottom part of the seat. Push down on the seat while pushing it towards the back of the vehicle. It is held in by spring load that pushes it into two hooks, one on each side, so it may take two people to push it back enough for it to clear the hooks. Get on your knees in the floor, push down & back at the same time on both sides of the seat, and it will release, and will come out by raising up on the front, and pulling it the rest of the way out. Once you have this out, look at the very bottom of the top part of the seat, and you will see a bolt on each side that goes through a tab that comes from the seat. Remove these, and lift the seat off the hooks by picking the seat straight up towards the top of the vehicle. Once you have this out, you should be able to remove the insulating stuff, and there will be two big holes that go directly into the trunk. If you have a magnet on a stick, or a telescoping magnet it would work to get the keys with, or someone will have to go through the hole to get them.
Glad to help out, Good Luck!!!