Help with raycast from a ragdoll

I have created a ragdoll that can move similar to a character controller, but now I have an issue with the detection of the collition of the raycast. I want to detect when the ragdoll is grounded, or touching the floor. This is the code that is wrong.

public static Rigidbody rb;

void IsGrounded() {

     RaycastHit hitInfo;
     if (Physics.Raycast(rb.transform.position + Vector3.down * 5f, Vector3.up * 5f, out hitInfo, Mathf.Infinity))
      
     {
         if (hitInfo.distance > 0.5f) // Change .1f to what you need
             Debug.DrawRay(rb.transform.position + Vector3.down * 50f, Vector3.up * 50f, Color.blue);

             isgrounded = false;

         if (hitInfo.distance < 0.5f)
             Debug.DrawRay(rb.transform.position + Vector3.down * 50f, Vector3.up * 50f, Color.red);
             isgrounded = true;
     }

 } 

// only the void IsGrounded is wrong, everything else is fine by the way