This is a civil case, taking away your freedom is only for criminal offenses. Not paying your bills is not a criminal offense. It is up to the creditor to look for your assets, etc.
A court can make you show up and answer questions about your assets and income. While you are in court the judge can make you give your gold watch to your creditor.
Outside the parameters of the question there are circumstances like failure to pay child support when you do have the funds that can lead to incarceration. In some places you can be jailed for contempt of court if the court requires your presence to let the creditor have the ability to try to get access to your assets and you do not show up.