I have an Android Galaxy J7 V and I don't use the key board to put in my password, I just have to swipe a certain way on the dots which I can't see to get into my phone.Since the keyboard is frozen I don't know what to do.
If you could manage to get another input application you could surely manage to switch to it in order to get that obscuring keyboard in the lockscreen. Alternatively if the phone has a custom recovery installed, you can delete that keyboard from
/system/app/SamsungKeyboard by using TWRP file manager so as to unlock the phone first before you look for another Keyboard app. Consequently, using a third risky way, you can move the app
/system/priv-app/SystemUI/SystemUI.apk to sdcard using TWRP and boot the phone. It will show no Lockscreen install alternative keyboard app and return that app back to where it was. This will allow you to have a non freezing app and gain access to the swipe to unlock. If incase you don't have TWRP and root, it sounds to me like you have to reset the phone by powering it on using this key combo. Power, Volume Up + Home Button and reset the phone from there. But never forget that Android 6 Marshmallow and above has Factory Reset Protection. If you don't remember the Primary Google Email logged in to the device, never try resetting from recovery since it will request them upon powering on again.