Tibetan monks frequently practice a moment of mindfulness each and every time they walk through a door. Sometimes they do this by remembering to recite a certain verse or mantra as they do so. Try this yourself for a day. Every time you walk through a door, pause, take a moment, breathe in and out. Bring yourself back to the moment. Then cross the threshold and walk on.
Lama Surya Das, Awakening to the Sacred: Creating a Spiritual Life from Scratch