Oloren

Then, by all means, let's open it. Since your searches found nothing, let's hope Evinrood contented himself with only a single trap here. Scribing a complex circular sigil which glows blue in the air before him, Oloren, inserts his hand into it and turns it as he speaks a few words. I trust you have a similar spell prepared, should we encounter any more locked doors?

Spoiler
Show
Curses, boards lost my first post. Casting knock on the door.

Train of thought: If they open inwards and don't have handles, it's just the arcane lock holding them there, and we're all far enough away to be okay, I think. He won't cast unless everyone is at least 30 feet away (which I think we all are).