There's no remote or key pad and the trunk is locked

Sounds like the drivers door module issue, take the door panel off unplug it make sure there is a good connection, Do the door locks, trunk and gas cap open from the key-less entry door pad?

your car does not have the function on the remote for opening the trunk only i think,
if the trunk stays locked with the central locks,than you should turn the key in the trunk lock for different position,
if now straight,turn to flat,if now horizontal,turn to 6 oclokck position,

Many People don't know exactly how to use the manual key attached to your remote to open the doors and trunk in case the battery is dead. All you have to do is slide the locking button in the back of your remote and pull the metal pre-cut key, then insert it in the trunk lock, turn key to the left and then push in. kawaboongha!!!

spray a little wd40 into the lock cylinder and insert the key and jiggle it until it works. this often happens if the lock cylinder gets little use, which is the case with remote activated locks. you will have to gain access to the mechanism if you want to see why it's not working with the remote.

1. Open trunk
2. Place latch in lock position
3. Pull inside trunk release to see what isn't moving
4. If trunk key won't turn, the key may be worn out and need to be replaced

open the remote and check to see if something needs re attatched... should be a quick fix for someone with a "sauder" gun

key pad no longer functions. try purchasing new key pad controller.

Yes, insure that you have power to the trunk lock inside trunk, If not could be lose/broken wire or shot fuse. I am sure the key fob does work for the doors? If not have key fob battery replaced. Also, a quick check on power to trunk lock, check to see if have remote power button inside car, if it works power is good. Defective key fob would then be indicated.

use your key to open the trunk. Then look at the on and off switch located on inside the trunk latch. Make sure it is in the unlock position.

A dealer or qualified locksmith can make a key from the VIN, provided the lock cylinders are original. Usually they will require proof of ownership before doing so.