The Violet Hold door is able to be lockpicked, and seems to be red for most of the way to 400 (Not at 400 yet, but on my way now!)
When you try to lockpick the door it will give you one skillpoint and then nothing else after that, but if you try it each day you can get a skillpoint (I've done it each day for 5 days now). I've tried different times too, to see what resets it, but the only thing that I see is that once a day I can lockpick the door.
This may be intended to be done only once a day, but it seems odd.
Anyways test it for yourself!