Can't access nested if...

Basically what i'm trying to do is create a collision volume, and when the player enters that volume a message is displayed 'press right mouse button to use weapon' and if they press the right mouse button they can use the weapon.

But before i write the code for the weapon im testing to see if im getting in the nested if, and im not...

I want the message to display, regardless of any buttons pressed, so i dont want to condition the if statement with a (collision + a button press)....

This is my code:-

 function OnTriggerEnter(collision:Collision)
 {
 
     if (collision != 'Player')
     {
         displayMessage = true;
         yield WaitForSeconds (displayTime);
         displayMessage = false;
         //Debug.Log("This is triggered");
         
         if (Input.GetMouseButtonDown(1))
         {
             Debug.Log('This will tell me if i get inside the nested if');
         }
     }

EDIT:

Ok so i moved :

 if (Input.GetMouseButton(1))
 {
     testPlayerCollision = true;
     Debug.Log('This will tell me if i get inside the nested if');
 }

outside of the first if statement, so i now have two if statements in the function, and they both work, but the second if waits until the first if is complete before it will work.

I assume this is down to the 'yield WaitForSeconds (displayTime);' but is there a way to still have my message showing for x amount of time and still triggering the second function?