My Samsung s6 phone doesn't lock

[AC Question]

Please help...my samsung s6 phone suddenly decided it's only gonna use swipe-lock to lock . I can't use passwords or patterns and my finger print doesn't work either. I might have entered password wrong but I can't do anything now. Everytime I try the settings page stops working-can anyone help.

 

[the tall guy]

Hi, so when u try and change the lock screen in the settings, what error message do you get? Is the options greyed out?