Jumping boolean check

I seen to hit a bug and I'm not sure how I go about fixing in. I've create a jump within the game which allows the sphere to go up couple of units as shown below, however if I jump and hit a wall my boolean check gets stuck and I'm unable to jump again for a couple of seconds. I've noticed that rigidbody.velocity.y doesn't always return 0 and returns something -7.4050503E or something i've tried Mathf.Approximately(rigidbody.velocity.y, 0) but problem still occurs, any tips?

     if(grounded == false && rigidbody.velocity.y == 0) {
         grounded = true;
     }
       
     if(Input.GetKeyDown(KeyCode.Space) && grounded == true) {
         rigidbody.AddForce(Vector3.up * jumpSpeed);
         grounded = false;
     }