Taarak Mehta Ka Ooltah Chashmah S01 E2777 Bagha Gets Late

"Problems Toh Hain Sabke Saath, Bas Nazariye Ki Hain Baat!"

Jethalal gets angry on Bagha and Nattu Kaka as they arrive late to shop and misses a good customer. On asking, Nattu Kaka escapes by saying Bagha is having the shops key but when Bagha arrives, gives a very silly reason. What is the reason?