Unfortunately that's the sad truth, some churches will stop being used and that leads to no renovation, which leads to decay.
Unfortunately the door or gate was closed, so no way I could take a photo of it. But I took a photo of another door, a similar one and I'm going to post it soon. So stay tuned as I have a photo of the lock :) I don't want to post it here before I post it in the post :P Seems like you know a lot about door locks :)
This is a photo from Wikipedia, about the interior. This is the best I can do. maybe one day I'm going to have a chance to visit it again.