My iPhone 4S has just shut off. Not responding to plugging into the mains, laptop, and I can't reset it by holding home & the lock button down because my lock button doesn't work. I don't know what to do!
  
  Added (1). I have no tools to open up my phone.
  
  Added (2). Already got the assisstive touch button   
  Read more: Unresponsive Iphone with broken lock button?