Door locks

Ok, I have another question about my 1997 Breeze. I can't unlock the doors with my key if the door is closed. If the door is open and I put the key in (to test it) the key will unlock the door. If the door is closed it won't work! Yet, the power door locks do work whether the door is open or closed. Any advice?
Thanks

Have similar problem.My back doors can not be unlocked.They behave as they are unlocked but wont open.