It needs to by a little colder than that. Next to zero degrees Kelvin.
There is something called spin spin interaction. It's small, but when you're that cold, it gets more significant for particles and that's what utimately makes the time crystal possible.
Also, unfortunately, it's not a means to control time. It just makes time distribution a bit more strange. We see time as a continuous variable through life, but it behaves like a discrete variable in the Crystal. That means it got a different distribution than usual in there and you can go from somewhere where time is faster or slower depending on the state.