Managed to get my character to stay crouched when he has a ceiling over head. Problem is he remains crouched.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerMovementController : MonoBehaviour
 {
     public float maxSpeed = 10f;
     bool facingRight = true;
 
     Animator anim;
 
     bool grounded = false;
     public Transform groundCheck;
     float groundRadius = 0.2f;
     public LayerMask whatIsGround;
     public float jumpForce = 0f;
 
     bool isCrouching = false;
     public float colliderCrouch = 0f;
     public float colliderStand = 0f;
 
     bool ceiling;
     public Transform ceilingCheck;
     float ceilingRadius = 0.2f;
     public LayerMask whatIsCeiling;
     
 
 
     // Start is called before the first frame update
     void Start()
     {
         anim = GetComponent<Animator>();
         
     }
 
     // Update is called once per frame
     void Update()
     {
 
         if(grounded && Input.GetButtonDown("Jump"))
         {
             anim.SetBool("Ground", false);
             GetComponent<Rigidbody2D>().AddForce(new Vector2(0, jumpForce));
         }
         
         //On button press player BoxCollider2D is reduced by float colliderCrouch
         if (grounded && Input.GetButtonDown("Crouch"))
         {
 
             GetComponent<BoxCollider2D>().size = new Vector2(0.2193601f, colliderCrouch);
             GetComponent<BoxCollider2D>().offset = new Vector2(0, -.25f);
             isCrouching = true;
         }
 
         //On button release player BoxCollider2D enlarges by float colliderStand 
 
 
         if (!ceiling && Input.GetButtonUp("Crouch"))
         {
             
             GetComponent<BoxCollider2D>().size = new Vector2(0.2193601f, colliderCrouch);
             GetComponent<BoxCollider2D>().offset = new Vector2(0, -.25f);
             isCrouching = false;
         }
 
 
         //If the GameObject is not crouching, send that the Boolean “Crouch” is false to the Animator. The crouch animation does not play.
         if (isCrouching == false)
             anim.SetBool("Crouch", false);
 
         //The GameObject is crouching, so send the Boolean as enabled to the Animator. The crouch animation plays.
         if (isCrouching == true)
             anim.SetBool("Crouch", true);
 
     }
 
     void FixedUpdate()
     {
         grounded = Physics2D.OverlapCircle(groundCheck.position, groundRadius, whatIsGround);
         anim.SetBool("Ground", grounded);
 
         ceiling = Physics2D.OverlapCircle(ceilingCheck.position, ceilingRadius, whatIsCeiling);
         anim.SetBool("Ceil", ceiling);
 
 
         anim.SetFloat("vSpeed", GetComponent<Rigidbody2D>().velocity.y);
 
         float move = Input.GetAxis("Horizontal");
 
         anim.SetFloat("Speed", Mathf.Abs(move));
         GetComponent<Rigidbody2D>().velocity = new Vector2(move * maxSpeed, GetComponent<Rigidbody2D>().velocity.y);
 
         if (move > 0 &&!facingRight)
             Flip();
 
         else if (move < 0 && facingRight)
             Flip();
     }
     void Flip()
     {
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
     }
     
     
 }