Have 2000 hyundai elantra cannot open both rear doors from inside or outside.They seem to be locked.called dealer want 90.00 just to look. how can door panel be removed without opening door?

Sounds to me like the child locks are on. Make sure the doors are unlocked first( if they are power locks unlock them manually to make sure they are unlocked), then try to open from the outside. It's just odd that both doors are doing the same thing. If that works, and you get both doors open, there is a small switch to disable the child lock near the latch on the door.

Door panels generally can not be removed with the door closed. There are plastic rivets that pop out when pulling the door panel away from the door frame.