How do i force lock my account

i use to used the key chain authenticator but was forced to change to the mobile one. i felt safer on the key chain one because it wasnt attached to any device. Heres where the question comes in. lets say someone tries to hack your account and you get a approve or disapprove but you push approve by accident instead of disapprove. so the hacker can do less damage than they already have.

how do you force your account to lock so they are kicked out?