picking up item activating script area

[HoyChampoy]

hey guys. i was wondering if i could do this. lets say a player walks through a hallway until the end and nothing happens. Lets says there's a key waiting at the end of the hallway. I want it so that when the player picks up the key, it activates a script area that is located in the hall way that the player previously crossed and when the player collides with it, it activates a scare. I just cant find out how to do this. Is there and engine script that sets a script area active after picking up an item? please help!