My iPhone was locked due to putting in so many wrong passwords how can I unlock it

You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot your iPhone passcode - Apple Support

I'm afraid you will have to follow the instructions I posted. JUst realize that your phone is safe from prying eyes, this is an Apple Security feature. It would be wise to start a back-up plan as soon as possible after restoring your phone!