A shader that rotate the texture on an object

I was trying to rotate the texture by setting the matrix, the shader that I used was the diffuse shader with a pass that sets the matrix.

I'm not familiar with shader at all so the I just edited as less as I could

 Shader "Diffuse" {
 Properties {
     _Color ("Main Color", Color) = (1,1,1,1)
     _MainTex ("Base (RGB)", 2D) = "white" {}
 }
 SubShader {
     Tags { "RenderType"="Opaque" }
     LOD 200
 
 CGPROGRAM
 #pragma surface surf Lambert
 
 sampler2D _MainTex;
 fixed4 _Color;
 
 struct Input {
     float2 uv_MainTex;
 };
 
 void surf (Input IN, inout SurfaceOutput o) {
     fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
     o.Albedo = c.rgb;
     o.Alpha = c.a;
 }
 ENDCG
 }
 Pass{
     SetTexture[_MainTex]
     {
         Matrix[_Matrix]
     }
 }
 
 
 Fallback "VertexLit"
 }

and I used the below code for rotation

     AccumulatedTime += Time.deltaTime * Speed;
     Matrix4x4 matrix =  Matrix4x4.TRS(Vector2.zero, Quaternion.Euler(0, 0,AccumulatedTime), tiling);
     renderer.material.SetTextureOffset("_MainTex", Offset);
     renderer.material.SetMatrix("_Matrix1", matrix);

But the problem is that first: the shader then kills all lighting. Second problem is it only rotates the texture based on a corner probably (0,0), I wanted to rotate the texture from the center, so I thought maybe changing the UV would work..

Any ideas? Sorry for being such a noob about shaders.