For most kinds of debt, you cannot go to jail for leaving them unpaid. The only consequences will be in the form of potential lawsuits and other negative life consequences.
Rule 212.2 - Pre-Trial Statement (a) Each party shall file and serve upon all other parties a written pre-trial statement in conformity with the requirements of Pa. R.C.P.
Under the Statute, the creditor has four years to file suit from the date the debtor defaulted on or breached the contract. If the creditor fails to file suit within four years, the creditor is barred from collecting the debt in court.
To obtain a judgment lien, you must first record the judgment with the court of common pleas in the county where the debtor owns property. The lien will stay in effect for five years, but can be renewed, if the debtor does not sell the property within that time period.