is it possible to break into other people's bases?

i was in a pickup truck armed with an sp9g (the rocket launcher truck) shooting at a door to somebody's base. i shooting for about 10 minutes and that door was still there.

I also had a re arm truck nearby to refill my truck ammo. are bases invincible? did the truck not have enough firepower? is there currently an in game way to destroy others doors/gates/walls?