Comment by pradn
This isn't all so unusual if its written into the job description. SREs in tech companies are expected to respond within a few minutes if they're paged in the middle of the night. They are usually compensated for their oncall time, however.
Expecting a worker to come to the factory out of fear or good will is not the way. Just write it into the contract/expectations/evaluations.
Out of the major players, Google is the only one I know of that compensates SREs for oncall time (and they do so fairly generously).