Yup, this was solved a while ago, but if memory serves, they didn't name the thread accurately like they should have.
Here's the updated one that won't show you the "Door Locked" msg when you approach with the key. Instead, if you have the Key, it'll display "Press ENTER To Use"
;Artificial Intelligence Script
;Header
desc = Key Door (Open 'With Key' and Close)
;Triggers
:state=0:hudreset,hudx=50,hudy=90,hudimagefine=gamecore\text\lockeddoor.tga,hudname=keydoorprompt,hudhide=1,hudmake=display
:state=0:hudreset,hudx=50,hudy=90,hudimagefine=gamecore\text\pressentertouse.tga,hudname=usedoorprompt,hudhide=1,hudmake=display,state=10
:state=10,plrdistwithin=60,plrhaskey=0:hudshow=keydoorprompt,hudfadeout=keydoorprompt
:state=10,plrdistwithin=60,plrhaskey=1:hudshow=usedoorprompt,hudfadeout=usedoorprompt
: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,plrdistfurther=60:state=3,sound=$1,colon
:state=3:decframe=0
:state=3,frameatstart=0:state=10,setframe=0
;End of Script
The one and only,
~PlystirE~
