Just rock it for 15 minutes at 12 psi, then leave it until Friday. Rocking it will not change the final carbonation level, it just speeds the process.
I like to lay a 2x4 on the floor, then set the keg on its side with the board at the mid-point. Then rock away.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk