According to Wikipedia : "A love lock is a padlock which lovers lock to a bridge, gate, or a similar public fixture to symbolize their love. Typically the sweethearts' names or initials are inscribed on the padlock, and its key is thrown away to symbolize unbreakable love".
A Nigerian DJ who is in Paris went in search of the padlock and according to him, he will find it, unlock it and throw in the water. Click here to watch https://www.instagram.com/p/BS0_9YZFo8J