Remember that it is completely natural for your mind to slip away and think about things you have to do, conversations, what’s happening around you etc. As you practice this regularly, it will become easier and easier to focus for the full five minutes. It’s important not to stress if you do lose track, just refocus and continue.
Some other great tools are meditation apps such as Insight Timer (Free) or Calms (subscription based). These provide guided and non guided meditations and you can choose the meditation based on how much time you have.
Wishing you a wonderful moment of meditation.