A free app for Android, by Nu-Kob.

App Lock is a tool that allows you to lock your apps and folders with a PIN, pattern, or fingerprint. It also provides a simple way to make your phone more secure by locking the applications you use the most.

To hide photos and videos, you will need to enable the fingerprint and pattern permissions. The fingerprint will be used to identify you, while the pattern will be used to unlock your apps. If you disable either of these permissions, you will not be able to use the fingerprint or pattern to hide your photos and videos.

To reset the password, you will need to go to the Android settings and find the password section. Then, you will need to answer the security question and reset the password.