Do you have a problem with people using your private lane? This could be lost drivers using the area to turn. Or a problem with people parking and then causing anti-social behaviours such as theft or vandalism.
It is possible to restrict or police access to the area by installing a gate, an arm barrier or security bollards. The type of product suitable depends on how many times a day authorised drivers will need to gain access to the area.
If the access lane sees high volumes of traffic, an arm barrier or a set of automatic bollards may be advisable. If access is very irregular and there are only a handful of people needing to move in and out of the lane. Retractable security-bollards or a gate may suffice.
All drivers needing access to the area can have the same key or key fob. These can easily be replaced if any have been lost.