Why isn't my move on collision script working?

I have a script that works as follows: It is assigned to a door object that is supposed to move up when it collides with the DoorChecker object which is a child object of the Player. The DoorChecker has the Door tag assigned to it and the script is set to activate on collision with an object carrying the Door tag. However, when I run it the door doesn't move at all.

Here is my script:

    var thePositionToMoveTo : Vector3;
    var theTag : String;
    var speed : float;
  
    function OnCollisionEnter2D(other : Collision2D) {
         if(other.gameObject.tag == theTag) {
               transform.position = Vector3.MoveTowards(transform.position, thePositionToMoveTo, speed);
         }
         
    }

I have variables for the position it is meant to move towards, the tag it's looking for, and the speed at which the object moves towards its destination.

Thanks in advance for any help.