Keyboard backlight won’t turn off

I got a Dell Inspiron 15 5000 in december 2018. The backlight keyboard worked perfectly fine with the f10 key, and then all of the sudden it stopped working. The keyboard light won’t turn off unless I let it timeout, and it gets really annoying because at night it is very bright and I can’t turn it off. I’ve tried using BIOS and there is no backlight option in Mobility center.