Swing door that opens on walking into it

This is a swing door that opens when you walk into it. Put this in a small prim that acts as a hinge, then link a door pannel to it. This has to be in the ROOT PRIM.

//17/1/9
//swing_door_collision_right_v1.0 olly butters
//Put this in a hinge and link the door to it.
//walking into the door will open it.

float opening_angle = 90; //opening angle surprisingly

default
{
    state_entry()
    {
        state closed; 
    }
}

//this is when the door is closed. touching it will open the door and change to open state.
state closed
{
    state_entry()
    {
    }
        
    collision_start(integer num_detected)
    {
        rotation dave = llEuler2Rot(<0.0,0.0,opening_angle*DEG_TO_RAD>);
        llSetRot(dave);
        state open;
    }
}

//this is when the door is open, it will sleep then close the door then move back to the closed state.
state open
{
    state_entry()
    {
        llSleep(5);
        rotation dave = llEuler2Rot(<0.0,0.0,0.0>);
        llSetRot(dave);
        state closed;
    }
}