Were You A Child of The 80s?
Yes,there is a seal for water at that point.get it replaced if possible.othervise open it and if seal is torne or damaged then the instant way of repair is that take an insulation of flexible electric wire and then use it as seal.Then replace when new one is available
Some locks have security measures built into the design that prevents if from being carded. If you have a normally keyed lock you have many options. You might look to the hinges, an open window, brute force, or drill out the lock. There are more subtle methods that are less appropriate for an open forum.