Controlled Spring Like Mechanism

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A mechanism is needed that mimics a spring's action but avoids the snapping effect. Automatic door closers have been tested but are deemed unsuitable due to excessive force requirements and size constraints. Suggestions include using springs in parallel with a pneumatic cylinder to manage the return action effectively. The ideal system should require only about 10 pounds of force for operation, allowing for a 5-10 inch expansion and similar contraction force upon release. The specific application for this mechanism remains unspecified.
swightness
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I have a need for a mechanism that acts juust like a spring (I pull, load it up, and when i let go it pulls away and returns to its normal length), but doesn't snap back like a spring.

I have experiemented with automatic door closers, but they are definatly not the answer (require too much force to pull, take too much space, too long)

Is there already a mechanism? Should i just use springs in parallel with a device like a pneumatic cylinder to control the return action? Idealy the system will only require a human to apply ~10lbs of force, and the spring/mechanism will expand ~5-10 inches, and when released, will contract with similar amount of force required to load the device
 
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