Ask a five year old to practice, and you may be in for a battle. Ask a five year old to play for you and you may be surprised! It's amazing how just this simple change in our wording turns the action into something positive and desirable.
Since the first step of learning to practice is to build playing music into your daily life, then we do not start off with the expectation of large amounts of time, or following a strict process. The first goal is to play something every day. That's it! Start there, establish a routine, and then we will go from there.