Crouching in 2D with 1 button

Hello,

I'm having trouble with making my 2D character crouch with 1 key input. Here's what I have so far...

 if (Input.GetKeyDown (KeyCode.LeftControl)) {
     anim.SetBool ("Crouch", !crouched);
         }
 
 if (Input.GetKeyDown (KeyCode.RightControl)) {
     anim.SetBool ("Crouch", crouched);
             }

"Crouch" is the parameter with an initial value of false. crouched is a boolean set to false.

This does work, if I press LeftControl the character crouches and if I press RightControl the character stands up again. What I need help with is how do I get it so that I press LeftControl the player crouches and then press the same key again to make him stand rather than having 2 keys to do the job.

Thanks for your help in advance.