Rotation Constrain

Hello, as many here I'm facing a certain difficulty

     public float objectRotation = 0.2f;
     
     void Start () {
     
     }
     
     void Update () 
     {
     gameObject.transform.Rotate(objectRotation, 0.0f, 0.0f);
     }

What I want to do is constrain the movement so that once it hits 60 degrees, it stops moving.

Thank you for your help.