The minimum wage increase will be in effect starting from June 1, 2014. Note that the pay period that straddles June 1, 2014 pay period should technically be treated as two pay periods, where an employee who works before June 1, 2014 are required to pay salary based on current minimum wage and after June 1, 2014 will be on new rate.
If employer X has pay period from April 26th to May 8th and Julie (an employee) worked total hours of 88 during this pay period. Note that the hours that Julie worked before June 1st will be paid based on current minimum wage ($10.25) and remaining hours will be at new rate ($11.00).
More details about the minimum wage can be found below at Ministry website.