Push the button and nothing happens? Verified that it was, in fact, unlocked?
You can actually remove the plastic panel from the inside without opening the hatch. I had the same thing happen a couple months back- the plastic clip (item #19 highlighted in red) that holds the linkage arm in place cracked in half
You can either replace it or creatively slap a couple zipties together to get you by for a few years more:
(I did actually just leave the plastic cover off, assuming that the zipties will need to be replaced at some point.)