Mechanic's liens in many states, expire after a period of time. For example, in many states, if the person/company filing the lien does not take legal action to enforce the lien within 90 to 180 days of filing, the lien will become unenforceable. In other states, to remain enforceable, the mechanic's lien must be refilled or updated to maintain in force.
In the case of a creditor lien, in many states, the creditor has to file suit and win the suit before they can file a lien.
As always, you should seek the advice of legal counsel in your city to determine the specifics of laws in your state with respect to liens.