It sounds like the lock rod from the door tumbler has fallen off. Then best way to fix this problem is to remove both front seats so you can get the door panel off. Then look inside the door to check the lock rod.
Here is a guide to help you get the door panel off.
Check out the diagrams (Below)
Please let us know if you need anything else to get the problem fixed.
Images (Click to enlarge)
Thursday, January 18th, 2018 AT 4:02 PM