Within about an hour you can replace that internally latched front door lock with a keyed.
How to replace a door lock and deadbolt.
To change a deadbolt lock start by unscrewing the old deadbolt and removing the interior and exterior faceplates.
Take care to measure carefully as matching the size can be especially problematic in older homes.
Before you learn how to change door locks measure the space where you ll install the replacement.
Then unscrew and remove the set plate which is the piece of metal that faces the doorframe.