Or Finn could have meant that he would use the Force to get past security and turn off the shield generator, or Finn could have meant any number of other things. The dialogue was unclear.
HAN
Sanitation? Then how do you know
how to disable the shields?
FINN
I don't. I'm just here to get Rey.
HAN
People are counting on us! The galaxy
is counting on us--!
FINN
Solo, we'll figure it out! We'll
use the Force!
HAN
That's not how the Force works--!