We need a three tiered prison system.
Tier one is for non-violent, or property crimes, that should require a fine as the primary sentence, if the person can not (or will not) pay the fine, then they should be locked up in a work realease facility, where they are released ONLY to work, and must return every day after their work shift, a portion of their wages is taken by the state to pay for housing them and paying the fine/victim restitution. When the sentence is fullfilled (the total dollar amount is reached), then they are released (note: it is possible to do "life" here too). Escape from tier one is considered a violent offfense, and they advance to tier two.
Tier two is for violent offenders and they must serve every day of their assigned sentence(s), no time off for good behavior, but time added for rule infractions or other crimes committed while locked up. Education and job training, including modest pay for any jobs done inside the prison, may be offered here but only to those willing to cooperate fully and maintain perfect behavior while locked up. Only first time and second time offenders are housed here, that have release dates within their "normal" life expectancy, all others go to tier three.
Tier three is for total losers, those with two prior tier two convictions, or that have committed crimes that warrant the LWOP sentence for their latest offense. There is NO EXIT from the tier three prison. The facility should be punative only, no training, recreation or any other amenities, beyond subsistance level meals, legal books (for appeal preparation) and basic hygene. A high rise structure would be preferred, as above the 5th floor no bars on windows are even needed, since escape by jumping would not be practical. As the prison fills, or inmates commit rule violations or other crimes, inmates are moved to ever higher floors. Once the prison is 90% full, allowing for new arrivals and maintanence of cell blocks, then those prisoners that are on the top floor are executed, either by "humane" means or other means, as voted on by the other tier three inmates. Those with friends and familiy inside a tier three prison may wish to donate funds to build more such towers, to keep their favorite inmates alive for a bit longer.