I can't unlock the drivers door???

Hi. I am unable to unlock my car door.... drivers side. I locked the car using the central locking and when I tried to unlock the car the drivers side would not open. I entered from another door and tried to open it manually but still it would not open.
Because the door is locked I cannot take of the panel to have a look at the inside.
Does anyone have any idea how to open a Sonata door??????
cheers Joe.

You might try disconnecting the negative battery cable and see if that releases the locking solenoid, if not, I am guessing something has broken or become disconnected internally.