No person shall be imprisoned for debt in this state, but this shall not prevent the legislature from providing for imprisonment, or holding to bail, persons charged with fraud in contracting said debt. A reasonable amount of property shall be exempt from seizure or sale for the payment of any debt or liability. The amount of such exemption shall be determined by law. Provided, however, that all property so exempted shall be liable to seizure and sale for any debts incurred to any person for work done or materials furnished in the construction, repair or improvement of the same, and provided further, that such liability to seizure and sale shall also extend to all real property for any debt to any laborer or servant for labor or service performed.