Cache::store('foo', 'bar', 3600);
Cache::getOrSet('foo', function() {
  return 'bar';
}, 3600); // 1 hour

$expiry = (new \DateTimeImmutable())
  ->modify('+1hour');

// as string
$expiry = (new \DateTimeImmutable())
  ->modify('+1hour')
  ->format('Y-m-d H:i:s');

// using Carbon //
$expiry = now()
  ->addHour()
  ->toDateTimeImmutable();

// as string
$expiry = now()
  ->addHour()
  ->toDateTimeString();

Cache::store('foo', 'bar', $expiry); // direct

Cache::getOrSet('foo', function() {
  return 'bar';
}, $expiry);