[Prokill911]

Simply put...
Make a stock function

which loops through ALL your houses getting each EXIT X Y Z
( The position they stand on to EXIT the house )

Then
In your "lockhouse"

Put an if statement
example

PHP код:

getStandingExit(playerid, Float:radius = 15.0) {
    for(new i=0;i<sizeof(Houses);i++) {
        if(IsPlayerInRangeOfPoint(playerid, radius, Houses[Player[i][House]][hExteriorX], Houses[Player[i][House]][hExteriorY], Houses[Player[i][House]][hExteriorZ])) {
            return i;
        }
    }
    return -1;
} 


OBVIOUSLY, You need to modify the code...
Because I just copied your EXTERIOR...
You need to get the INTERIOR coords