Switch statement not running on every frame

Hello there! This will probably be really obvious and simple but the switch statement I have implemented in my code does not exactly work 100%. All I'm trying to do is pick up a weapon, hold down a button to charge a throw then release the button to fire it (like throwing a spear). I have my methods for charging the throw and releasing (I think) but for now I'm just trying to get it to work with simple Debug.Log statements. As you can see down in my switch statement where it says "Debug.Log("CHARGING");" I want that to appear every frame as long as I hold down the button and as soon as I release said button it should print "FIRE" once.

As of right now it only seems to print out "CHARGING" once while I hold the button which isn't right at all. I know something probably isn't right with one of my statements but could anyone help debug my code and point out where I screwed up? This is my first post so any help is great, thanks!

Edit: All this code is running within the update function for a little extra info in case anyone thought this was why it wasn't working.

Code

     if (playerOnWeapon)
     {
         switch (pickedUpWeapon)
         {
             
             case false:
                 if (Input.GetKeyDown(KeyCode.M))
                 {
                     pickedUpWeapon = true;
                     weapon.transform.parent = weaponGrabber;
                     weapon.transform.position = weaponGrabber.transform.position;
                     weapon.transform.rotation = weaponGrabber.transform.rotation;
                     weaponRB.isKinematic = true;
                     Debug.Log("You picked up the weapon");
                 }
                 break;

             case true:

                 if (Input.GetKey(KeyCode.N)) //Holding down charge button
                 {
                     if (!isCharging)
                     {
                         isCharging = true;
                         Debug.Log("CHARGING");
                     }
                     
                 }

                 else //No longer holding down the charge button
                 {
                     if (isCharging)
                     {
                         pickedUpWeapon = false;
                         isCharging = false;
                         Debug.Log("FIRE");
                     }
                     
                 }
                 break;
         } 
     }