how to make a statement happen only once in a certain condition

I am trying to make my character in Unity 2D be able to hang onto an edge until I press a button and it will either climb up or fall down depending on what you press, but until you press somet$$anonymous$$ng it just hangs there, and to make sure it doesnt fall down I made the gravityscale 0 and the velocity in both axis 0 as well, once you press W it will go back to normal and pull you up, but the problem is that it would make the velocity 0 and gravity scale 0 on each frame, I need it to happen only on the first frame that it detects that you are on a ledge (using a raycast), every frame after that it doesnt need to update it until I either press W or S feel free to ask any clarifying questions because I am not very good at explaining t$$anonymous$$ngs

t$$anonymous$$s is the first script(I wrote t$$anonymous$$s in two scripts to keep it a bit more organized):

  // name of the raycast
     if (hangEdge)
             {
     
                 if (Input.GetKey(KeyCode.W))
                 {
     
                     rb.gravityScale = 5;
     
                     transform.position = Vector3.Lerp(transform.position, myPosition[posIndex], lerpTime * Time.deltaTime);
                     t = Mathf.Lerp(t, 1f, lerpTime * Time.deltaTime);
     
                     if (t > 0.9f)
                     {
     
                         t = 0f;
                         posIndex++;
                         posIndex = (posIndex >= lengtht) ? 0 : posIndex;
     
                     }
     
                 }
             }

second script:

if (hangEdge) {

         //get rigidbody component(rb is the name of a rigidbody2D variable)
         rb.GetComponent<Rigidbody2D>();

         if (myFunctionCalled == false)
         {

             //change velocity on both x and y axis to 0(essentially tell player to stop moving)
             rb.velocity = new Vector2(0, 0);
             //set the gravity on t$$anonymous$$s object(the player) to 0
             rb.gravityScale = 0;

             myFunctionCalled = true;

         }
     }
     else 
     {

         

         //set gravity on t$$anonymous$$s object(the player) to 5
         rb.gravityScale = 5;

     }

I also made my own attempt at solving the problem, to no avail