how can car get stuck in 5th gear but seems to be in neutral. on 2009 Chevrolet Aveo

wife went to shift to 5th and the shifter got stuck,but it seems to be in neutral.

Does the shift lever move around? When clutch is released, does car try to move?
shifter on the transmission doesn't move.when car is running just idles doesn't move.can be pushed forward or back.
Sure sounds like an internal shift fork problem! It will have to be checked hands on to be sure.
how is that done.