key isnt working, locker is broken

Hi there.

Im talking about a bmw 316 from 2003.

The key button from both keys are not working for a long time. So we were using the keys manually.

Today the key locker from driver side (wich already had some difficulties to open) got completly broken. The key goes left and right but the lock button doesnt move. And this button is kind of lower than the other doors

So the only extra key locker is the one from the trunk. That one is working well. But how do i get in now?? Do i have to remove the back seats ?? Is there any extra keys locker on another door?

Thanks.

key isnt working, locker is broken