No problems entering the snake temple as many times as you like - been there many times for rooms I have missed, coins for the rogues quest, extra bard scrolls of trickerey, and came back for the statue of Kerah. Go to the room with the chute that is too small to fall down (some would call it the monkey room). The passage / lock is not in this room, it is back a little ways towards where you met Krueg the high wizard (ie towards the back entrance). From the door to the monkey room, there is a short passage to your right before it bends right again. From memory it is at that bend that the lock is that takes the heretic key. Stand at the monkey room and cast spirit eye and look for white dots on your expanded map (blow it up more if you have to).
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