Embodiments for barrier assemblies and setup configuration of these barrier assemblies are disclosed. The barriers are used to block the entry of children or animal into areas in which their safety may be jeopardized. The barrier assemblies contain a sheet configured for outstretching and for retraction into a roll form, and for being maintained under tension in an outstretched form. A locking assembly prevents the sheet from accidentally retracting. The barrier assemblies are configured for indoor use by means of attaching to walls and stair posts as well as for outdoor use by anchoring the barrier assembly to the ground.