I walk back and forth trying to get the trunk open and nothing happens. Did I miss something or is this a glitch. Earlier the trident kept getting stuck on the statue and I had to walk downstairs and back up to get it to follow me.

It took me a while to work this out too. I finally did it by positioning Grace facing and touching the car, and only then pressing the space bar. In my previous attempts I kept the space bar pressed while I approached the car.
It was annoying to see the game make this distinction, because it is not how we would expect it to work after playing AitD1.