My Android phone will not go into sleep mode does anyone know the reason why

[AC Question]

My Android phone just started not going into sleep mode all on its own I push the button for it to turn off and it don't it will power off but it will not it will not power off I'm sorry does anybody have any suggestions for me

 

[the tall guy]

Hi, what device do you have? so are you not able to lock the phone, are you only able to turn it off? if you go into settings, then display - what do you have as the screen time out option, can you change this to something like 10 seconds?