Okay, if you can't unlock it from the inside either, you will need to remove the inner door panel which is a pain with the door closed. Once it's removed, check the linkage to the locking mechanism. Either it is broken or disconnected.
Here is a guide that will help you get an idea of what needs to be done
https://www.2carpros.com/articles/door-panel-removal
Please let us know what happens.
Cheers,
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Wednesday, March 11th, 2015 AT 6:45 PM