Thank you for reaching out to the Samsung community! We are glad to inform that you can use secure folder to unlock an application of the device. Kindly go to settings>>lock screen and security>>Secure folder. Set up the secure folder and tap on add apps. The application added in secure folder will be lock. To open that application unlock secure folder and you can access the applications stored in it.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
