It seems that you have erroneously activated the 'Unlock Mode' in which the car doors will not turn off automatically i.e Speed Sensitive Door Lock Function will not work
To Activate Speed Sensing Auto Door Lock
> Open the Driver Door of your vehicle.Keep it open till the end of process
> With your vehicle key in the Key cylinder, turn Ignition ON and then switch it OFF.
> Press and release the Security Alarm switch One time.
> Now again Press Security Alarm switch and Hold in
> One chirp sound confirms entry into Drive Lock programming mode.
> Press the Key “Lock” button (while holding the Security switch), a single chirp sound confirms mode changed to speed lock..
> Release the Security switch. Your car Speed Sensitive Door Lock will be activated again.
Else - you may also call up Nippon India Customer Care
As the car is under warranty - you can get free door side assistance. 24 Hour Customer Care Number is - 1800 1800 0080 (Pan India) or Call 011-39898920 (Exclusive Customer Service Center for Delhi / NCR)