If I clock out at 5:56pm and my employer rounds it down to 5:45pm is that against the law?

I work for a moving company and I clock out and soon as I’m done because I’m assuming they would respect the rounding system, but I noticed that when I was all finished just 4 minutes before 6pm they decided to round my time down to a 545pm, I know it’s just 15 minutes of work but if this is happening consistently it definitely is gonna add up. I’m just curious if this is violating any laws or if it’s just a dick move? I live in British Columbia, Canada