This video captured on a shop surveillance system shows the moment an armed robber strolls into a store in Houston and asks the cashier to open the till. She declines his request and calmly ushers a customer (with baby) out of the premises and locks the door behind her. After a brief bit of thievery the robber then tries to leave only to realise he’s locked in and there’s no way out. He starts to beg for forgiveness but eventually the police turn up. According to some reports the perpetrator was subsequently given a five-year sentence for armed robbery.