Collider Help

Having trouble with the boundary and destroy by boundary script. It is not deleting when bullets come in contact.

SpaceShooter/Assets/Prefabs/Bolt.prefab

@@ -27,8 +27,8 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 2786470009650213004}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0, y: 0, z: 0}
-  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 1}
+  m_LocalScale: {x: 0.25, y: 0.75, z: 1}
   m_Children:
   - {fileID: 5826147667051634208}
   m_Father: {fileID: 0}
@@ -68,8 +68,8 @@ CapsuleCollider2D:
   m_IsTrigger: 1
   m_UsedByEffector: 0
   m_UsedByComposite: 0
-  m_Offset: {x: 0, y: 0}
-  m_Size: {x: 0.17020008, y: 0.35282898}
+  m_Offset: {x: -0.005437523, y: -0.0036384861}
+  m_Size: {x: 0.24275368, y: 0.37455338}
   m_Direction: 0
 --- !u!114 &1073888857780383466
 MonoBehaviour:

SpaceShooter/Assets/Scripts/DestroyByBoundary.cs

@@ -0,0 +1,16 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DestroyByBoundary : MonoBehaviour
+{
+    //void OnTriggerExit2D(Collider2D other)
+    // {
+    //   Destroy(other.gameObject);
+    //}
+
+    void OnTriggerExit(Collider other)
+    {
+        Destroy(other.gameObject);
+    }
+}

SpaceShooter/Assets/Scripts/PlayerController.cs

@@ -12,6 +12,21 @@ public class PlayerController : MonoBehaviour
     public float speed;
     public Boundary boundary;
 
+    public GameObject shot;
+    public Transform shotSpawn;
+    public float fireRate;
+
+    private float nextFire;
+
+   void Update()
+    {
+        if (Input.GetKeyDown("space") && Time.time > nextFire)
+        {
+            nextFire = Time.time + fireRate;
+            Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
+        }
+    }
+
     void FixedUpdate()
     {
         float moveHorizontal = Input.GetAxis("Horizontal");