Phone stuck on screen lock

I cant do anything with my phone. It doesnt react at all. I have pressed and held all buttons, tried charging it, everything, but it wont open. The green light is blinking like i have a message, but when i try to open my phone nothing happens. And i cant restart my phone without opening it first. Im pretty sure my only choice at this point is to take out the battery and put it back in and hope it restarts, but i dont know how to remove the battery. it feels stuck in there.