Induced Flowering

Hi all! I have some questions regarding induced flowering.

I have six plants growing in separate pots in my backyard that are just over a month old, measuring 12 to 13 inches high with 5 sets of true leaves. Due to security reasons as well as me wanting to enjoy them sooner I am planning on bringing them inside to a completely dark room for twelve hours of darkness starting at 7:30 PM, and then taking them out for twelve hours of light at 7:30 AM. My questions are the following:

1) Are the plants too young to induce flowering? If so, how much longer do you think should I wait?
2) Would temperature be an issue if my dark room is couple degrees warmer than outside at night?

Thanks for you kind help!!

The plants age is no issue, the temperature difference should not be an issue if not to HOT in the dark room.