Try this
I am NOT a coder but I got it to work for me.
;Artificial Intelligence Script
;Header
desc = Key Door (Open 'With Key' and make door useless)
;Triggers
:state=0:hudreset,hudx=50,hudy=90,hudimagefine=gamecore\text\lockeddoor.tga,hudname=keydoorprompt,hudhide=1,hudmake=display,state=10
:state=10,plrdistwithin=60:hudshow=keydoorprompt,hudfadeout=keydoorprompt
:state=10,plrdistwithin=60,plrhaskey=1,plrusingaction=1:state=1,setframe=0,sound=$0
:state=1:incframe=0
:state=1,frameatend=0:state=2,coloff
:state=2,plrdistwithin=60,plrusingaction=1:activate=0
:state=2,activated=0:coloff
:state=2,activated=0:state=3,sound=$1,colon
:state=3:decframe=0
:state=3,frameatstart=0:state=20,setframe=0
;End of Script
Life is a short trip to another world