Unresponsive Iphone with broken lock button?

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

Try removing the battery and sticking it back in. Also, check this link for how to get around your broken lock button: http://www.macworld.co.uk/how-to/iphone/how-fix-broken-iphone-lock-button-power-buttons-stopped-working-3464222/

Take it to a repair shop