Pintu is a gateway, a start, an opening. So when it is said to be pintu, I think what it really means is that how we are in the morning will determine our rezeki for that day. If we enter the day with positiveness, rezeki will be positive. If we enter the day with negativity, our rezeki will be negative; either way it is still our rezeki.
I have had this conversation before with my eldest son Haikal. He use to wake up grumpy and I said to him, if you wake up smiling and happy, the day will turn out smiley and happy. Just like young kids; waking up full of energy and see how their day always is, full of play and happiness. My 2 cents worth this morning.