Used lock pad in a video, now I cant do anything

[Android Central Question]

I was watching some clips during which i hit the padlock in fullscreen. Not knowing what to do to fix it, i forced restart but no improvment

Grateful for all assistance

 

[MarcusTiger]

Here is a clip to visulize https://youtu.be/DY5Q_q3e5XQ

 

[Rukbat]

Hold the power button in until the phone restarts (it could take up to 30 seconds).