2007 music video with zombies and grandma turns into a zombie

I remember a music video when I was like 10 years old, around 2007. There was the dead coming back to life. Teenagers were trying to escape them and at the end when everything seemed okay. The grandma of one of the teenagers turned into a zombie and went into his room and she had a really creepy zombie-ish smile.

I think it was a rock/punk/metal band.

That last part traumatized me, that's why I remember and I just want to see how bad it was now that I'm older.