The door latch doesn't open from the inside.
There are two most likely possibilities, one is the linkage from the inner door handle to the door latch has become detached or that the door latch assembly is faulty. To determine if the linkage or latch is the issue the door panel will have to be removed and then the linkage inspected. If the latch is faulty then the latch will have to be replaced as there are no serviceable parts in the latch assembly. You may want to enlist the help of a mechanic, like one from YourMechanic, who will have specialized trim tools to remove the door panel without damaging it and inspect the latch and linkage assembly.
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