Mmmyeah, Thorn wasn't appreciating having someone locked behind a door. With a quick glance over her shoulder to make sure the other cultists were being well and truly distracted and wouldn't see her, she hunkered down by the lock and gave it a good look. Checked it for hidden triggers, tiny wires or lines that might break, or the telltale runes of glows of magical traps waiting for anything other than the correctly imbued key to be inserted into the mechanism...
(Perception to attempt to find any traps that might be on this door.)
[roll0]