Hello can anyone help me i am new in scripting

What i am trying to do is if my player get the key , i want the door open by walking on italt text

Not sure how your door is setup, but maybe something like this will work?

if(other.tag == "key1"){
    Destroy(other.gameObject);
    key1obtained = true;
}

if(other.tag == "door1" && key1obtained){
    other.gameObject.GetComponent<DoorScript>().Open();
}