The key will not open the trunk of my 1998 Cutlass Ciera. Where is the emergency release?

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Normally you remove the back seat back, and pull the emergency release. Or a mobile locksmith can get in. If the lock is worn, any similar shape key may work with some jiggling. Also look in the glove box for a release button.

I just found this in your Owner Manual for Cutlass Supreme

Remote Trunk Release (OPTION) Press the yellow trunk release button located under the instrument panel on the driver's side. Your automatic transaxle must be in P (Park). Remember that your trunk can be opened at any time using the lock release. Be sure to lock your doors

and also access into the back.

Trunk Access Panel If you have split rear seats, you may have a trunk access panel for storing long objects like skis. Pull your rear armrest down using the strap. Then pull the latch on the trunk access panel towards you to open the panel. To close the access panel lift the latch.

https://carmanuals2.com/get/oldsmobile-cutlass-supreme-1993-owner-s-manual-79185

Videos regarding a locked trunk.

https://www.google.com/search?q=open+the+trunk+on+93+oldsmobile+cutlass+ciera+without+key

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Question edited for clarity.
Question moved to Audi A8.

Get in through the back seats and pull the emergency latch.

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Shoot WD40 up in the key hole as well up in the latch area up where the latch would be and some times this works. These should be lubricated several times a year but most people do not think about these areas. All doors should be done as well.

emergency release tab in trunk, in case someone is shut up in there!

I have a 2015 Ford Mustang. The trunk/manual release was pulled and now my trunk won't open using the key fob or rear button. Any suggestions?

remove the back seat, so you can open the trunk by the interior

http://instameme.com/1995+oldsmobile+ciera

this may help. it describe fishing the keys out via the back seat. button is usually in the glove box

ONLY TWO WAYS I KNOW OF(THEY BOTH DO WORK THOUGH AS CRAZY AS THEY SOUND)1:TAKE OUT BACK OF BACK SEAT AND TURN LITTE PIN LEVER IN CENTER LID OF TRUNK,OR 2:USE A DENT PULLER IN TRUNK KEY HOLE! SORRY THAT ALL I CAN RECOMMEND!

Open trunk take off the backing on the inside of trunk this will expose the bulb housing.

For some stupid reason Chrysler put a switch in the trunk that if tripped prevents it from being opened. You'll need to get into the trunk through the back seat. On the latch there is a small white switch. You need to move it to the unlock position. If you can find emergency release in the trunk that will open it and you can find the switch from the outside.