The second thing you should do once the key doesn’t enter the lock, is to lubricate the key-way. Sometimes outdoor locks can collect a lot of dirt and dust inside the lock cylinder. That can cause the pins to get stuck and prevent the key from entering and turning the lock.
Therefore, you should try to spray a little dry lubricant in the lock. You need to spray lubricant in the keyway and then try to insert the key a few times. However, in some cases, there is a problem with the lock itself that a lubricant spray can’t solve. In those cases, the best thing to do is to call a locksmith service for assistance.
Furthermore, please don’t try to unlock the door or remove the key by yourself. That is because without the right tools and the necessary knowledge you can cause serious damage to the lock.