"Your door latch is not fully closed, please lock into place."

I had the same problem, with a snap touch, I don't know if it works the same, but I found a solution in my case. No idea of the version.

There is a teeth on the side of the screen, it pushes another part when closed.

You have to remove the panel. One screw in my case, remove it and slide the panel.

There is a snake shape plastic part, you can push it while starting the polaroid, if it works just add a bit of glue on top of this part.

If it does not work, my solution is to install a bypass on the electronic board.

For that you have to remove the front panel, check the tutorial to change the battery for that, in the LPaff's message. Once it's done, remove the battery, you should have an electronic board like the picture below, remove the two screws.

Flip the board over the printer, there is another board below the first one, remove the 3 screws.

You have to flip the board, but be gentle. There is a cable, from the printer side on the hidden side of the board (blue circle in the picture below), you have to remove it, I used tweezers to do so. Once you flip it, in the red circle you have a square part with two metal sheets in it. I soldered a small copper wire between the two. There should be a component in the yellow circle, but it's missing in my case and it works so...

Once it's done, reassemble, don't forget the wire mention above.

There are clearly cleaner solution than bypassing the system, but it worked for me.

Hopefully, it will help someone.

Good luck.

Sorry for bad English