Defining  isBruteForce according to the definition.

We are defining brute force if two consecutive login attempts are made in very short span of time (say 1 second) or many request are made in specified time (For example if 5 request are made within 25 seconds) then it will be a brute force.

To correctly define isBruteForce function, we will require one more column FIRST_LOGIN_ATTEMPT in the table PASSWORD. Firstly we will check time between two consecutive request, if it is less than bruteForceLockTimePeriod then this function will return true. 
If time between two consecutive request is more than 1 seconds (value of bruteForceLockTimePeriod) however more than 5 attempts are made within bruteForceLockAttemptTotalTime then it will be a brute force.