[spoiler]
That's what I thought you meant but wasn't sure.
Yes he'll stick his hand through, but only quick/far enough to grab the door knob/handle. As a player, do I want him to? Nope Spot check to notice Chauser's c. 10-foot pole
1d20+2=16[/spoiler]
(If he notices the c. 10 foot pole)--Chauser's collaspible 10 foot pole catches his eye just as he's about to reach through the darkness for the door handle.
"Chauser, mind if I borrow that for a few moments?" He asks indicating to the c. 10 foot pole. (Assuming Chauser hands him the pole)
"Thank you" Taking the pole, he extends it and proceeds to reach it through the darkness to catch the door handle and pull the door close. He then moves to rejoin the group, handing the recollapsed pole back to Chauser with a nod.
(If he does not)-- His hand is quickly reached through the darkness to grab the door handle and pull it closed. He then moves to rejoin the group at the right door.